Interval (music)
In music theory, an interval is the difference in pitch between two sounds.^{[1]} An interval may be described as horizontal, linear, or melodic if it refers to successively sounding tones, such as two adjacent pitches in a melody, and vertical or harmonic if it pertains to simultaneously sounding tones, such as in a chord.^{[2]}^{[3]}
In Western music, intervals are most commonly differences between notes of a diatonic scale. The smallest of these intervals is a semitone. Intervals smaller than a semitone are called microtones. They can be formed using the notes of various kinds of nondiatonic scales. Some of the very smallest ones are called commas, and describe small discrepancies, observed in some tuning systems, between enharmonically equivalent notes such as C♯ and D♭. Intervals can be arbitrarily small, and even imperceptible to the human ear.
In physical terms, an interval is the ratio between two sonic frequencies. For example, any two notes an octave apart have a frequency ratio of 2:1. This means that successive increments of pitch by the same interval result in an exponential increase of frequency, even though the human ear perceives this as a linear increase in pitch. For this reason, intervals are often measured in cents, a unit derived from the logarithm of the frequency ratio.
In Western music theory, the most common naming scheme for intervals describes two properties of the interval: the quality (perfect, major, minor, augmented, diminished) and number (unison, second, third, etc.). Examples include the minor third or perfect fifth. These names identify not only the difference in semitones between the upper and lower notes, but also how the interval is spelled. The importance of spelling stems from the historical practice of differentiating the frequency ratios of enharmonic intervals such as G–G♯ and G–A♭.^{[4]}
Contents
 1 Size
 2 Main intervals
 3 Interval number and quality
 4 Shorthand notation
 5 Inversion
 6 Classification
 7 Minute intervals
 8 Compound intervals
 9 Intervals in chords
 10 Size of intervals used in different tuning systems
 11 Interval root
 12 Interval cycles
 13 Alternative interval naming conventions
 14 Pitchclass intervals
 15 Generic and specific intervals
 16 Generalizations and nonpitch uses
 17 See also
 18 Notes
 19 References
 20 External links
Size [ edit ]
The size of an interval (also known as its width or height) can be represented using two alternative and equivalently valid methods, each appropriate to a different context: frequency ratios or cents.
Frequency ratios [ edit ]
The size of an interval between two notes may be measured by the ratio of their frequencies. When a musical instrument is tuned using a just intonation tuning system, the size of the main intervals can be expressed by smallinteger ratios, such as 1:1 (unison), 2:1 (octave), 5:3 (major sixth), 3:2 (perfect fifth), 4:3 (perfect fourth), 5:4 (major third), 6:5 (minor third). Intervals with smallinteger ratios are often called just intervals, or pure intervals.
Most commonly, however, musical instruments are nowadays tuned using a different tuning system, called 12tone equal temperament. As a consequence, the size of most equaltempered intervals cannot be expressed by smallinteger ratios, although it is very close to the size of the corresponding just intervals. For instance, an equaltempered fifth has a frequency ratio of 2^{7⁄12}:1, approximately equal to 1.498:1, or 2.997:2 (very close to 3:2). For a comparison between the size of intervals in different tuning systems, see § Size of intervals used in different tuning systems.
Cents [ edit ]
The standard system for comparing interval sizes is with cents. The cent is a logarithmic unit of measurement. If frequency is expressed in a logarithmic scale, and along that scale the distance between a given frequency and its double (also called octave) is divided into 1200 equal parts, each of these parts is one cent. In twelvetone equal temperament (12TET), a tuning system in which all semitones have the same size, the size of one semitone is exactly 100 cents. Hence, in 12TET the cent can be also defined as one hundredth of a semitone.
Mathematically, the size in cents of the interval from frequency f_{1} to frequency f_{2} is
Main intervals [ edit ]
The table shows the most widely used conventional names for the intervals between the notes of a chromatic scale. A perfect unison (also known as perfect prime)^{[5]} is an interval formed by two identical notes. Its size is zero cents. A semitone is any interval between two adjacent notes in a chromatic scale, a whole tone is an interval spanning two semitones (for example, a major second), and a tritone is an interval spanning three tones, or six semitones (for example, an augmented fourth).^{[a]} Rarely, the term ditone is also used to indicate an interval spanning two whole tones (for example, a major third), or more strictly as a synonym of major third.
Intervals with different names may span the same number of semitones, and may even have the same width. For instance, the interval from D to F♯ is a major third, while that from D to G♭ is a diminished fourth. However, they both span 4 semitones. If the instrument is tuned so that the 12 notes of the chromatic scale are equally spaced (as in equal temperament), these intervals also have the same width. Namely, all semitones have a width of 100 cents, and all intervals spanning 4 semitones are 400 cents wide.
The names listed here cannot be determined by counting semitones alone. The rules to determine them are explained below. Other names, determined with different naming conventions, are listed in a separate section. Intervals smaller than one semitone (commas or microtones) and larger than one octave (compound intervals) are introduced below.
Number of semitones 
Minor, major, or perfect intervals 
Short  Augmented or diminished intervals 
Short  Widely used alternative names 
Short  Audio 

0  Perfect unison ^{ [5] } ^{ [b] }  P1  Diminished second  d2  Play (help·info)  
1  Minor second  m2  Augmented unison ^{ [5] } ^{ [b] }  A1  Semitone,^{[c]} half tone, half step  S  Play (help·info) 
2  Major second  M2  Diminished third  d3  Tone, whole tone, whole step  T  Play (help·info) 
3  Minor third  m3  Augmented second  A2  Play (help·info)  
4  Major third  M3  Diminished fourth  d4  Play (help·info)  
5  Perfect fourth  P4  Augmented third  A3  Play (help·info)  
6  Diminished fifth  d5  Tritone ^{ [a] }  TT  Play (help·info)  
Augmented fourth  A4  
7  Perfect fifth  P5  Diminished sixth  d6  Play (help·info)  
8  Minor sixth  m6  Augmented fifth  A5  Play (help·info)  
9  Major sixth  M6  Diminished seventh  d7  Play (help·info)  
10  Minor seventh  m7  Augmented sixth  A6  Play (help·info)  
11  Major seventh  M7  Diminished octave  d8  Play (help·info)  
12  Perfect octave  P8  Augmented seventh  A7  Play (help·info) 
Interval number and quality [ edit ]
In Western music theory, an interval is named according to its number (also called diatonic number) and quality. For instance, major third (or M3) is an interval name, in which the term major (M) describes the quality of the interval, and third (3) indicates its number.
Number [ edit ]
The number of an interval is the number of letter names it encompasses or staff positions it encompasses. Both lines and spaces (see figure) are counted, including the positions of both notes forming the interval. For instance, the interval C–G is a fifth (denoted P5) because the notes from C to the G above it encompass five letter names (C, D, E, F, G) and occupy five consecutive staff positions, including the positions of C and G. The table and the figure above show intervals with numbers ranging from 1 (e.g., P1) to 8 (e.g., P8). Intervals with larger numbers are called compound intervals.
There is a onetoone correspondence between staff positions and diatonicscale degrees (the notes of a diatonic scale)^{[d]}. This means that interval numbers can be also determined by counting diatonic scale degrees, rather than staff positions, provided that the two notes that form the interval are drawn from a diatonic scale. Namely, C–G is a fifth because in any diatonic scale that contains C and G, the sequence from C to G includes five notes. For instance, in the A♭major diatonic scale, the five notes are C–D♭–E♭–F–G (see figure). This is not true for all kinds of scales. For instance, in a chromatic scale, the notes from C to G are eight (C–C♯–D–D♯–E–F–F♯–G). This is the reason interval numbers are also called diatonic numbers, and this convention is called diatonic numbering.
If one adds any accidentals to the notes that form an interval, by definition the notes do not change their staff positions. As a consequence, any interval has the same interval number as the corresponding natural interval, formed by the same notes without accidentals. For instance, the intervals C–G♯ (spanning 8 semitones) and C♯–G (spanning 6 semitones) are fifths, like the corresponding natural interval C–G (7 semitones).
Notice that interval numbers represent an inclusive count of encompassed staff positions or note names, not the difference between the endpoints. In other words, one starts counting the lower pitch as one, not zero. For that reason, the interval C–C, a perfect unison, is called a prime (meaning "1"), even though there is no difference between the endpoints. Continuing, the interval C–D is a second, but D is only one staff position, or diatonicscale degree, above C. Similarly, C–E is a third, but E is only two staff positions above C, and so on. As a consequence, joining two intervals always yields an interval number one less than their sum. For instance, the intervals C–E and E–G are thirds, but joined together they form a fifth (C–G), not a sixth. Similarly, a stack of three thirds, such as C–E, E–G, and G–B, is a seventh (C–B), not a ninth.
This scheme applies to intervals up to an octave (12 semitones). For larger intervals, see § Compound intervals below.
Quality [ edit ]
The name of any interval is further qualified using the terms perfect (P), major (M), minor (m), augmented (A), and diminished (d). This is called its interval quality. It is possible to have doubly diminished and doubly augmented intervals, but these are quite rare, as they occur only in chromatic contexts. The quality of a compound interval is the quality of the simple interval on which it is based.
Perfect [ edit ]
Perfect intervals are socalled because they were traditionally considered perfectly consonant,^{[6]} although in Western classical music the perfect fourth was sometimes regarded as a less than perfect consonance, when its function was contrapuntal.^{[vague]} Conversely, minor, major, augmented or diminished intervals are typically considered less consonant, and were traditionally classified as mediocre consonances, imperfect consonances, or dissonances.^{[6]}
Within a diatonic scale^{[d]} all unisons (P1) and octaves (P8) are perfect. Most fourths and fifths are also perfect (P4 and P5), with five and seven semitones respectively. One occurrence of a fourth is augmented (A4) and one fifth is diminished (d5), both spanning six semitones. For instance, in a Cmajor scale, the A4 is between F and B, and the d5 is between B and F (see table).
By definition, the inversion of a perfect interval is also perfect. Since the inversion does not change the pitch class of the two notes, it hardly affects their level of consonance (matching of their harmonics). Conversely, other kinds of intervals have the opposite quality with respect to their inversion. The inversion of a major interval is a minor interval, the inversion of an augmented interval is a diminished interval.
Major and minor [ edit ]
As shown in the table, a diatonic scale^{[d]} defines seven intervals for each interval number, each starting from a different note (seven unisons, seven seconds, etc.). The intervals formed by the notes of a diatonic scale are called diatonic. Except for unisons and octaves, the diatonic intervals with a given interval number always occur in two sizes, which differ by one semitone. For example, six of the fifths span seven semitones. The other one spans six semitones. Four of the thirds span three semitones, the others four. If one of the two versions is a perfect interval, the other is called either diminished (i.e. narrowed by one semitone) or augmented (i.e. widened by one semitone). Otherwise, the larger version is called major, the smaller one minor. For instance, since a 7semitone fifth is a perfect interval (P5), the 6semitone fifth is called "diminished fifth" (d5). Conversely, since neither kind of third is perfect, the larger one is called "major third" (M3), the smaller one "minor third" (m3).
Within a diatonic scale,^{[d]} unisons and octaves are always qualified as perfect, fourths as either perfect or augmented, fifths as perfect or diminished, and all the other intervals (seconds, thirds, sixths, sevenths) as major or minor.
Augmented and diminished [ edit ]
Augmented intervals are wider by one semitone than perfect or major intervals, while having the same interval number (i.e., encompassing the same number of staff positions). Diminished intervals, on the other hand, are narrower by one semitone than perfect or minor intervals of the same interval number. For instance, an augmented third such as C–E♯ spans five semitones, exceeding a major third (C–E) by one semitone, while a diminished third such as C♯–E♭ spans two semitones, falling short of a minor third (C–E♭) by one semitone.
The augmented fourth (A4) and the diminished fifth (d5) are the only augmented and diminished intervals that appear in diatonic scales^{[d]} (see table).
Example [ edit ]
Neither the number, nor the quality of an interval can be determined by counting semitones alone. As explained above, the number of staff positions must be taken into account as well.
For example, as shown in the table below, there are four semitones between A♭ and B♯, between A and C♯, between A and D♭, and between A♯ and E, but
 A♭–B♯ is a second, as it encompasses two staff positions (A, B), and it is doubly augmented, as it exceeds a major second (such as A–B) by two semitones.
 A–C♯ is a third, as it encompasses three staff positions (A, B, C), and it is major, as it spans 4 semitones.
 A–D♭ is a fourth, as it encompasses four staff positions (A, B, C, D), and it is diminished, as it falls short of a perfect fourth (such as A–D) by one semitone.
 A♯E is a fifth, as it encompasses five staff positions (A, B, C, D, E), and it is triply diminished, as it falls short of a perfect fifth (such as A–E) by three semitones.
Number of semitones 
Interval name  Staff positions  

1  2  3  4  5  
4  doubly augmented second  A♭  B♯  
4  major third  A  C♯  
4  diminished fourth  A  D♭  
4  triply diminished fifth  A♯  E 
Shorthand notation [ edit ]
Intervals are often abbreviated with a P for perfect, m for minor, M for major, d for diminished, A for augmented, followed by the interval number. The indications M and P are often omitted. The octave is P8, and a unison is usually referred to simply as "a unison" but can be labeled P1. The tritone, an augmented fourth or diminished fifth is often TT. The interval qualities may be also abbreviated with perf, min, maj, dim, aug. Examples:
 m2 (or min2): minor second,
 M3 (or maj3): major third,
 A4 (or aug4): augmented fourth,
 d5 (or dim5): diminished fifth,
 P5 (or perf5): perfect fifth.
Inversion [ edit ]
A simple interval (i.e., an interval smaller than or equal to an octave) may be inverted by raising the lower pitch an octave or lowering the upper pitch an octave. For example, the fourth from a lower C to a higher F may be inverted to make a fifth, from a lower F to a higher C.
There are two rules to determine the number and quality of the inversion of any simple interval:^{[7]}
 The interval number and the number of its inversion always add up to nine (4 + 5 = 9, in the example just given).
 The inversion of a major interval is a minor interval, and vice versa; the inversion of a perfect interval is also perfect; the inversion of an augmented interval is a diminished interval, and vice versa; the inversion of a doubly augmented interval is a doubly diminished interval, and vice versa.
For example, the interval from C to the E♭ above it is a minor third. By the two rules just given, the interval from E♭ to the C above it must be a major sixth.
Since compound intervals are larger than an octave, "the inversion of any compound interval is always the same as the inversion of the simple interval from which it is compounded."^{[8]}
For intervals identified by their ratio, the inversion is determined by reversing the ratio and multiplying by 2. For example, the inversion of a 5:4 ratio is an 8:5 ratio.
For intervals identified by an integer number of semitones, the inversion is obtained by subtracting that number from 12.
Since an interval class is the lower number selected among the interval integer and its inversion, interval classes cannot be inverted.
Classification [ edit ]
Intervals can be described, classified, or compared with each other according to various criteria.
Melodic and harmonic [ edit ]
An interval can be described as
 Vertical or harmonic if the two notes sound simultaneously
 Horizontal, linear, or melodic if they sound successively.^{[2]}
Diatonic and chromatic [ edit ]
In general,
 A diatonic interval is an interval formed by two notes of a diatonic scale.
 A chromatic interval is a nondiatonic interval formed by two notes of a chromatic scale.
The table above depicts the 56 diatonic intervals formed by the notes of the C major scale (a diatonic scale). Notice that these intervals, as well as any other diatonic interval, can be also formed by the notes of a chromatic scale.
The distinction between diatonic and chromatic intervals is controversial, as it is based on the definition of diatonic scale, which is variable in the literature. For example, the interval B–E♭ (a diminished fourth, occurring in the harmonic Cminor scale) is considered diatonic if the harmonic minor scales are considered diatonic as well.^{[9]} Otherwise, it is considered chromatic. For further details, see the main article.
By a commonly used definition of diatonic scale^{[d]} (which excludes the harmonic minor and melodic minor scales), all perfect, major and minor intervals are diatonic. Conversely, no augmented or diminished interval is diatonic, except for the augmented fourth and diminished fifth.
The distinction between diatonic and chromatic intervals may be also sensitive to context. The abovementioned 56 intervals formed by the Cmajor scale are sometimes called diatonic to C major. All other intervals are called chromatic to C major. For instance, the perfect fifth A♭–E♭ is chromatic to C major, because A♭ and E♭ are not contained in the C major scale. However, it is diatonic to others, such as the A♭ major scale.
Consonant and dissonant [ edit ]
Consonance and dissonance are relative terms that refer to the stability, or state of repose, of particular musical effects. Dissonant intervals are those that cause tension and desire to be resolved to consonant intervals.
These terms are relative to the usage of different compositional styles.
 In 15th and 16thcentury usage, perfect fifths and octaves, and major and minor thirds and sixths were considered harmonically consonant, and all other intervals dissonant, including the perfect fourth, which by 1473 was described (by Johannes Tinctoris) as dissonant, except between the upper parts of a vertical sonority—for example, with a supporting third below ("63 chords").^{[10]} In the common practice period, it makes more sense to speak of consonant and dissonant chords, and certain intervals previously considered dissonant (such as minor sevenths) became acceptable in certain contexts. However, 16thcentury practice was still taught to beginning musicians throughout this period.
 Hermann von Helmholtz (1821–1894) defined a harmonically consonant interval as one in which the two pitches have an upper partial (an overtone) in common.^{[11]} This essentially defines all seconds and sevenths as dissonant, and the above thirds, fourths, fifths, and sixths as consonant.
 David Cope (1997) suggests the concept of interval strength,^{[12]} in which an interval's strength, consonance, or stability is determined by its approximation to a lower and stronger, or higher and weaker, position in the harmonic series. See also: Lipps–Meyer law and #Interval root
All of the above analyses refer to vertical (simultaneous) intervals.
Simple and compound [ edit ]
A simple interval is an interval spanning at most one octave (see Main intervals above). Intervals spanning more than one octave are called compound intervals, as they can be obtained by adding one or more octaves to a simple interval (see below for details).^{[13]}
Steps and skips [ edit ]
Linear (melodic) intervals may be described as steps or skips. A step, or conjunct motion,^{[14]} is a linear interval between two consecutive notes of a scale. Any larger interval is called a skip (also called a leap), or disjunct motion.^{[14]} In the diatonic scale,^{[d]} a step is either a minor second (sometimes also called half step) or major second (sometimes also called whole step), with all intervals of a minor third or larger being skips.
For example, C to D (major second) is a step, whereas C to E (major third) is a skip.
More generally, a step is a smaller or narrower interval in a musical line, and a skip is a wider or larger interval, where the categorization of intervals into steps and skips is determined by the tuning system and the pitch space used.
Melodic motion in which the interval between any two consecutive pitches is no more than a step, or, less strictly, where skips are rare, is called stepwise or conjunct melodic motion, as opposed to skipwise or disjunct melodic motions, characterized by frequent skips.
Enharmonic intervals [ edit ]
Two intervals are considered enharmonic, or enharmonically equivalent, if they both contain the same pitches spelled in different ways; that is, if the notes in the two intervals are themselves enharmonically equivalent. Enharmonic intervals span the same number of semitones.
For example, the four intervals listed in the table below are all enharmonically equivalent, because the notes F♯ and G♭ indicate the same pitch, and the same is true for A♯ and B♭. All these intervals span four semitones.
Number of semitones 
Interval name  Staff positions  

1  2  3  4  
4  major third  F♯  A♯  
4  major third  G♭  B♭  
4  diminished fourth  F♯  B♭  
4  doubly augmented second  G♭  A♯ 
When played as isolated chords on a piano keyboard, these intervals are indistinguishable to the ear, because they are all played with the same two keys. However, in a musical context, the diatonic function of the notes these intervals incorporate is very different.
The discussion above assumes the use of the prevalent tuning system, 12tone equal temperament ("12TET"). But in other historic meantone temperaments, the pitches of pairs of notes such as F♯ and G♭ may not necessarily coincide. These two notes are enharmonic in 12TET, but may not be so in another tuning system. In such cases, the intervals they form would also not be enharmonic. For example, in quartercomma meantone, all four intervals shown in the example above would be different.
Minute intervals [ edit ]
There are also a number of minute intervals not found in the chromatic scale or labeled with a diatonic function, which have names of their own. They may be described as microtones, and some of them can be also classified as commas, as they describe small discrepancies, observed in some tuning systems, between enharmonically equivalent notes. In the following list, the interval sizes in cents are approximate.
 A Pythagorean comma is the difference between twelve justly tuned perfect fifths and seven octaves. It is expressed by the frequency ratio 531441:524288 (23.5 cents).
 A syntonic comma is the difference between four justly tuned perfect fifths and two octaves plus a major third. It is expressed by the ratio 81:80 (21.5 cents).
 A septimal comma is 64:63 (27.3 cents), and is the difference between the Pythagorean or 3limit "7th" and the "harmonic 7th".
 A diesis is generally used to mean the difference between three justly tuned major thirds and one octave. It is expressed by the ratio 128:125 (41.1 cents). However, it has been used to mean other small intervals: see diesis for details.
 A diaschisma is the difference between three octaves and four justly tuned perfect fifths plus two justly tuned major thirds. It is expressed by the ratio 2048:2025 (19.6 cents).
 A schisma (also skhisma) is the difference between five octaves and eight justly tuned fifths plus one justly tuned major third. It is expressed by the ratio 32805:32768 (2.0 cents). It is also the difference between the Pythagorean and syntonic commas. (A schismic major third is a schisma different from a just major third, eight fifths down and five octaves up, F♭ in C.)
 A kleisma is the difference between six minor thirds and one tritave or perfect twelfth (an octave plus a perfect fifth), with a frequency ratio of 15625:15552 (8.1 cents) (Play (help·info)).
 A septimal kleisma is the amount that two major thirds of 5:4 and a septimal major third, or supermajor third, of 9:7 exceeds the octave. Ratio 225:224 (7.7 cents).
 A quarter tone is half the width of a semitone, which is half the width of a whole tone. It is equal to exactly 50 cents.
Compound intervals [ edit ]
A compound interval is an interval spanning more than one octave.^{[13]} Conversely, intervals spanning at most one octave are called simple intervals (see Main intervals above).
In general, a compound interval may be defined by a sequence or "stack" of two or more simple intervals of any kind. For instance, a major tenth (two staff positions above one octave), also called compound major third, spans one octave plus one major third.
Any compound interval can be always decomposed into one or more octaves plus one simple interval. For instance, a major seventeenth can be decomposed into two octaves and one major third, and this is the reason why it is called a compound major third, even when it is built by adding up four fifths.
The diatonic number DN_{c} of a compound interval formed from n simple intervals with diatonic numbers DN_{1}, DN_{2}, ..., DN_{n}, is determined by:
which can also be written as:
The quality of a compound interval is determined by the quality of the simple interval on which it is based. For instance, a compound major third is a major tenth (1+(8−1)+(3−1) = 10), or a major seventeenth (1+(8−1)+(8−1)+(3−1) = 17), and a compound perfect fifth is a perfect twelfth (1+(8−1)+(5−1) = 12) or a perfect nineteenth (1+(8−1)+(8−1)+(5−1) = 19). Notice that two octaves are a fifteenth, not a sixteenth (1+(8−1)+(8−1) = 15). Similarly, three octaves are a twentysecond (1+3×(8−1) = 22), and so on.
Main compound intervals [ edit ]
Number of semitones 
Minor, major, or perfect intervals 
Short  Augmented or diminished intervals 
Short 

12  Diminished ninth  d9  
13  Minor ninth  m9  Augmented octave  A8 
14  Major ninth  M9  Diminished tenth  d10 
15  Minor tenth  m10  Augmented ninth  A9 
16  Major tenth  M10  Diminished eleventh  d11 
17  Perfect eleventh  P11  Augmented tenth  A10 
18  Diminished twelfth  d12  
Augmented eleventh  A11  
19  Perfect twelfth or Tritave  P12  Diminished thirteenth  d13 
20  Minor thirteenth  m13  Augmented twelfth  A12 
21  Major thirteenth  M13  Diminished fourteenth  d14 
22  Minor fourteenth  m14  Augmented thirteenth  A13 
23  Major fourteenth  M14  Diminished fifteenth  d15 
24  Perfect fifteenth or Double octave  P15  Augmented fourteenth  A14 
25  Augmented fifteenth  A15 
It is also worth mentioning here the major seventeenth (28 semitones)—an interval larger than two octaves that can be considered a multiple of a perfect fifth (7 semitones) as it can be decomposed into four perfect fifths (7 × 4 = 28 semitones), or two octaves plus a major third (12 + 12 + 4 = 28 semitones). Intervals larger than a major seventeenth seldom come up, most often being referred to by their compound names, for example "two octaves plus a fifth"^{[15]} rather than "a 19th".
Intervals in chords [ edit ]
Chords are sets of three or more notes. They are typically defined as the combination of intervals starting from a common note called the root of the chord. For instance a major triad is a chord containing three notes defined by the root and two intervals (major third and perfect fifth). Sometimes even a single interval (dyad) is considered a chord.^{[16]} Chords are classified based on the quality and number of the intervals that define them.
Chord qualities and interval qualities [ edit ]
The main chord qualities are: major, minor, augmented, diminished, halfdiminished, and dominant. The symbols used for chord quality are similar to those used for interval quality (see above). In addition, + or aug is used for augmented, ° or dim for diminished, ^{ø} for half diminished, and dom for dominant (the symbol − alone is not used for diminished).
Deducing component intervals from chord names and symbols [ edit ]
The main rules to decode chord names or symbols are summarized below. Further details are given at Rules to decode chord names and symbols.
 For 3note chords (triads), major or minor always refer to the interval of the third above the root note, while augmented and diminished always refer to the interval of the fifth above root. The same is true for the corresponding symbols (e.g., Cm means C^{m3}, and C+ means C^{+5}). Thus, the terms third and fifth and the corresponding symbols 3 and 5 are typically omitted. This rule can be generalized to all kinds of chords,^{[e]} provided the abovementioned qualities appear immediately after the root note, or at the beginning of the chord name or symbol. For instance, in the chord symbols Cm and Cm^{7}, m refers to the interval m3, and 3 is omitted. When these qualities do not appear immediately after the root note, or at the beginning of the name or symbol, they should be considered interval qualities, rather than chord qualities. For instance, in Cm^{M7} (minor major seventh chord), m is the chord quality and refers to the m3 interval, while M refers to the M7 interval. When the number of an extra interval is specified immediately after chord quality, the quality of that interval may coincide with chord quality (e.g., CM^{7} = CM^{M7}). However, this is not always true (e.g., Cm^{6} = Cm^{M6}, C+^{7} = C+^{m7}, CM^{11} = CM^{P11}).^{[e]} See main article for further details.
 Without contrary information, a major third interval and a perfect fifth interval (major triad) are implied. For instance, a C chord is a C major triad, and the name C minor seventh (Cm^{7}) implies a minor 3rd by rule 1, a perfect 5th by this rule, and a minor 7th by definition (see below). This rule has one exception (see next rule).
 When the fifth interval is diminished, the third must be minor.^{[f]} This rule overrides rule 2. For instance, Cdim^{7} implies a diminished 5th by rule 1, a minor 3rd by this rule, and a diminished 7th by definition (see below).
 Names and symbols that contain only a plain interval number (e.g., “seventh chord”) or the chord root and a number (e.g., “C seventh”, or C^{7}) are interpreted as follows:
 If the number is 2, 4, 6, etc., the chord is a major added tone chord (e.g., C^{6} = C^{M6} = C^{add6}) and contains, together with the implied major triad, an extra major 2nd, perfect 4th, or major 6th (see names and symbols for added tone chords).
 If the number is 7, 9, 11, 13, etc., the chord is dominant (e.g., C^{7} = C^{dom7}) and contains, together with the implied major triad, one or more of the following extra intervals: minor 7th, major 9th, perfect 11th, and major 13th (see names and symbols for seventh and extended chords).
 If the number is 5, the chord (technically not a chord in the traditional sense, but a dyad) is a power chord. Only the root, a perfect fifth and usually an octave are played.
The table shows the intervals contained in some of the main chords (component intervals), and some of the symbols used to denote them. The interval qualities or numbers in boldface font can be deduced from chord name or symbol by applying rule 1. In symbol examples, C is used as chord root.
Main chords  Component intervals  

Name  Symbol examples  Third  Fifth  Seventh 
Major triad  C  M3  P5  
CM, or Cmaj  M3  P5  
Minor triad  Cm, or Cmin  m3  P5  
Augmented triad  C+, or Caug  M3  A5  
Diminished triad  C°, or Cdim  m3  d5  
Dominant seventh chord  C^{7}, or C^{dom7}  M3  P5  m7 
Minor seventh chord  Cm^{7}, or Cmin^{7}  m3  P5  m7 
Major seventh chord  CM^{7}, or Cmaj^{7}  M3  P5  M7 
Augmented minor seventh chord  C+^{7}, Caug^{7}, C^{7♯5}, or C^{7aug5} 
M3  A5  m7 
Diminished seventh chord  C°^{7}, or Cdim^{7}  m3  d5  d7 
Halfdiminished seventh chord  C^{ø}^{7}, Cm^{7♭5}, or Cm^{7dim5}  m3  d5  m7 
Size of intervals used in different tuning systems [ edit ]
Number of semitones 
Name  5limit tuning (pitch ratio) 
Comparison of interval width (in cents)  

5limit tuning 
Pythagorean tuning 
^{1}⁄_{4}comma meantone 
Equal temperament 

0  Perfect unison  1:1  0  0  0  0 
1  Minor second  16:15 27:25 
112 133 
90  117  100 
2  Major second  9:8 10:9 
204 182 
204  193  200 
3  Minor third  6:5 32:27 
316 294 
294 318 
310 (wolf) 269 
300 
4  Major third  5:4  386  408 384 
386 (wolf) 427 
400 
5  Perfect fourth  4:3 27:20 
498 520 
498 (wolf) 522 
503 (wolf) 462 
500 
6  Augmented fourth Diminished fifth 
45:32
25:18 
590
569 
612 588 
579 621 
600 
7  Perfect fifth  3:2 40:27 
702 680 
702 (wolf) 678 
697 (wolf) 738 
700 
8  Minor sixth  8:5  814  792  814  800 
9  Major sixth  5:3 27:16 
884 906 
906  890  900 
10  Minor seventh  16:9 9:5 
996 1018 
996  1007  1000 
11  Major seventh  15:8 50:27 
1088 1067 
1110  1083  1100 
12  Perfect octave  2:1  1200  1200  1200  1200 
In this table, the interval widths used in four different tuning systems are compared. To facilitate comparison, just intervals as provided by 5limit tuning (see symmetric scale n.1) are shown in bold font, and the values in cents are rounded to integers. Notice that in each of the nonequal tuning systems, by definition the width of each type of interval (including the semitone) changes depending on the note that starts the interval. This is the art of just intonation. In equal temperament, the intervals are never precisely in tune with each other. This is the price of using equidistant intervals in a 12tone scale. For simplicity, for some types of interval the table shows only one value (the most often observed one).
In ^{1}⁄_{4}comma meantone, by definition 11 perfect fifths have a size of approximately 697 cents (700 − ε cents, where ε ≈ 3.42 cents); since the average size of the 12 fifths must equal exactly 700 cents (as in equal temperament), the other one must have a size of about 738 cents (700 + 11ε, the wolf fifth or diminished sixth); 8 major thirds have size about 386 cents (400 − 4ε), 4 have size about 427 cents (400 + 8ε, actually diminished fourths), and their average size is 400 cents. In short, similar differences in width are observed for all interval types, except for unisons and octaves, and they are all multiples of ε (the difference between the ^{1}⁄_{4}comma meantone fifth and the average fifth). A more detailed analysis is provided at ^{1}⁄_{4}comma meantone Size of intervals. Note that ^{1}⁄_{4}comma meantone was designed to produce just major thirds, but only 8 of them are just (5:4, about 386 cents).
The Pythagorean tuning is characterized by smaller differences because they are multiples of a smaller ε (ε ≈ 1.96 cents, the difference between the Pythagorean fifth and the average fifth). Notice that here the fifth is wider than 700 cents, while in most meantone temperaments, including ^{1}⁄_{4}comma meantone, it is tempered to a size smaller than 700. A more detailed analysis is provided at Pythagorean tuning#Size of intervals.
The 5limit tuning system uses just tones and semitones as building blocks, rather than a stack of perfect fifths, and this leads to even more varied intervals throughout the scale (each kind of interval has three or four different sizes). A more detailed analysis is provided at 5limit tuning#Size of intervals. Note that 5limit tuning was designed to maximize the number of just intervals, but even in this system some intervals are not just (e.g., 3 fifths, 5 major thirds and 6 minor thirds are not just; also, 3 major and 3 minor thirds are wolf intervals).
The abovementioned symmetric scale 1, defined in the 5limit tuning system, is not the only method to obtain just intonation. It is possible to construct juster intervals or just intervals closer to the equaltempered equivalents, but most of the ones listed above have been used historically in equivalent contexts. In particular, the asymmetric version of the 5limit tuning scale provides a juster value for the minor seventh (9:5, rather than 16:9). Moreover, the tritone (augmented fourth or diminished fifth), could have other just ratios; for instance, 7:5 (about 583 cents) or 17:12 (about 603 cents) are possible alternatives for the augmented fourth (the latter is fairly common, as it is closer to the equaltempered value of 600 cents). The 7:4 interval (about 969 cents), also known as the harmonic seventh, has been a contentious issue throughout the history of music theory; it is 31 cents flatter than an equaltempered minor seventh. For further details about reference ratios, see 5limit tuning#The justest ratios.
In the diatonic system, every interval has one or more enharmonic equivalents, such as augmented second for minor third.
Interval root [ edit ]
Although intervals are usually designated in relation to their lower note, David Cope^{[12]} and Hindemith^{[17]} both suggest the concept of interval root. To determine an interval's root, one locates its nearest approximation in the harmonic series. The root of a perfect fourth, then, is its top note because it is an octave of the fundamental in the hypothetical harmonic series. The bottom note of every odd diatonically numbered intervals are the roots, as are the tops of all even numbered intervals. The root of a collection of intervals or a chord is thus determined by the interval root of its strongest interval.
As to its usefulness, Cope^{[12]} provides the example of the final tonic chord of some popular music being traditionally analyzable as a "submediant sixfive chord" (added sixth chords by popular terminology), or a first inversion seventh chord (possibly the dominant of the mediant V/iii). According to the interval root of the strongest interval of the chord (in first inversion, CEGA), the perfect fifth (C–G), is the bottom C, the tonic.
Interval cycles [ edit ]
Interval cycles, "unfold [i.e., repeat] a single recurrent interval in a series that closes with a return to the initial pitch class", and are notated by George Perle using the letter "C", for cycle, with an intervalclass integer to distinguish the interval. Thus the diminishedseventh chord would be C3 and the augmented triad would be C4. A superscript may be added to distinguish between transpositions, using 0–11 to indicate the lowest pitch class in the cycle.^{[18]}
Alternative interval naming conventions [ edit ]
As shown below, some of the abovementioned intervals have alternative names, and some of them take a specific alternative name in Pythagorean tuning, fivelimit tuning, or meantone temperament tuning systems such as quartercomma meantone. All the intervals with prefix sesqui are justly tuned, and their frequency ratio, shown in the table, is a superparticular number (or epimoric ratio). The same is true for the octave.
Typically, a comma is a diminished second, but this is not always true (for more details, see Alternative definitions of comma). For instance, in Pythagorean tuning the diminished second is a descending interval (524288:531441, or about −23.5 cents), and the Pythagorean comma is its opposite (531441:524288, or about 23.5 cents). 5limit tuning defines four kinds of comma, three of which meet the definition of diminished second, and hence are listed in the table below. The fourth one, called syntonic comma (81:80) can neither be regarded as a diminished second, nor as its opposite. See Diminished seconds in 5limit tuning for further details.
Number of semitones 
Generic names  Specific names  

Quality and number  Other naming convention  Pythagorean tuning  5limit tuning 
^{1}⁄_{4}comma meantone 

Full  Short  
0  perfect unison or perfect prime 
P1  
diminished second  d2  descending Pythagorean comma (524288:531441) 
lesser diesis (128:125)  
diaschisma (2048:2025) greater diesis (648:625) 

1  minor second  m2  semitone, half tone, half step 
diatonic semitone, minor semitone 
limma (256:243)  
augmented unison or augmented prime 
A1  chromatic semitone, major semitone 
apotome (2187:2048)  
2  major second  M2  tone, whole tone, whole step  sesquioctavum (9:8)  
3  minor third  m3  sesquiquintum (6:5)  
4  major third  M3  sesquiquartum (5:4)  
5  perfect fourth  P4  sesquitertium (4:3)  
6  diminished fifth  d5  tritone ^{ [a] }  
augmented fourth  A4  
7  perfect fifth  P5  sesquialterum (3:2)  
12  perfect octave  P8  duplex (2:1) 
Additionally, some cultures around the world have their own names for intervals found in their music. For instance, 22 kinds of intervals, called shrutis, are canonically defined in Indian classical music.
Latin nomenclature [ edit ]
Up to the end of the 18th century, Latin was used as an official language throughout Europe for scientific and music textbooks. In music, many English terms are derived from Latin. For instance, semitone is from Latin semitonus.
The prefix semi is typically used herein to mean "shorter", rather than "half".^{[19]}^{[20]}^{[21]} Namely, a semitonus, semiditonus, semidiatessaron, semidiapente, semihexachordum, semiheptachordum, or semidiapason, is shorter by one semitone than the corresponding whole interval. For instance, a semiditonus (3 semitones, or about 300 cents) is not half of a ditonus (4 semitones, or about 400 cents), but a ditonus shortened by one semitone. Moreover, in Pythagorean tuning (the most commonly used tuning system up to the 16th century), a semitritonus (d5) is smaller than a tritonus (A4) by one Pythagorean comma (about a quarter of a semitone).
Number of semitones 
Quality and number  Short  Latin nomenclature 

0  Perfect unison  P1  unisonus 
1  Minor second  m2  semitonus 
Augmented unison  A1  unisonus superflua  
2  Major second  M2  tonus 
Diminished third  d3  
3  Minor third  m3  semiditonus 
Augmented second  A2  tonus superflua  
4  Major third  M3  ditonus 
Diminished fourth  d4  semidiatessaron  
5  Perfect fourth  P4  diatessaron 
Augmented third  A3  ditonus superflua  
6  Diminished fifth  d5  semidiapente, semitritonus 
Augmented fourth  A4  tritonus  
7  Perfect fifth  P5  diapente 
Diminished sixth  d6  semihexachordum  
8  Minor sixth  m6  hexachordum minus, semitonus maius cum diapente, tetratonus 
Augmented fifth  A5  diapente superflua  
9  Major sixth  M6  hexachordum maius, tonus cum diapente 
Diminished seventh  d7  semiheptachordum  
10  Minor seventh  m7  heptachordum minus, semiditonus cum diapente, pentatonus 
Augmented sixth  A6  hexachordum superflua  
11  Major seventh  M7  heptachordum maius, ditonus cum diapente 
Diminished octave  d8  semidiapason  
12  Perfect octave  P8  diapason 
Augmented seventh  A7  heptachordum superflua 
Pitchclass intervals [ edit ]
In posttonal or atonal theory, originally developed for equaltempered European classical music written using the twelvetone technique or serialism, integer notation is often used, most prominently in musical set theory. In this system, intervals are named according to the number of half steps, from 0 to 11, the largest interval class being 6.
In atonal or musical set theory, there are numerous types of intervals, the first being the ordered pitch interval, the distance between two pitches upward or downward. For instance, the interval from C upward to G is 7, and the interval from G downward to C is −7. One can also measure the distance between two pitches without taking into account direction with the unordered pitch interval, somewhat similar to the interval of tonal theory.
The interval between pitch classes may be measured with ordered and unordered pitchclass intervals. The ordered one, also called directed interval, may be considered the measure upwards, which, since we are dealing with pitch classes, depends on whichever pitch is chosen as 0. For unordered pitchclass intervals, see interval class.^{[22]}
Generic and specific intervals [ edit ]
In diatonic set theory, specific and generic intervals are distinguished. Specific intervals are the interval class or number of semitones between scale steps or collection members, and generic intervals are the number of diatonic scale steps (or staff positions) between notes of a collection or scale.
Notice that staff positions, when used to determine the conventional interval number (second, third, fourth, etc.), are counted including the position of the lower note of the interval, while generic interval numbers are counted excluding that position. Thus, generic interval numbers are smaller by 1, with respect to the conventional interval numbers.
Comparison [ edit ]
Specific interval  Generic interval  Diatonic name  

Number of semitones  Interval class  
0  0  0  Perfect unison 
1  1  1  Minor second 
2  2  1  Major second 
3  3  2  Minor third 
4  4  2  Major third 
5  5  3  Perfect fourth 
6  6  3 4 
Augmented fourth Diminished fifth 
7  5  4  Perfect fifth 
8  4  5  Minor sixth 
9  3  5  Major sixth 
10  2  6  Minor seventh 
11  1  6  Major seventh 
12  0  7  Perfect octave 
Generalizations and nonpitch uses [ edit ]
The term "interval" can also be generalized to other music elements besides pitch. David Lewin's Generalized Musical Intervals and Transformations uses interval as a generic measure of distance between time points, timbres, or more abstract musical phenomena.^{[23]}^{[24]}
See also [ edit ]
 Music and mathematics
 Circle of fifths
 List of pitch intervals
 List of meantone intervals
 Ear training
 Pseudooctave
 Regular temperament
Notes [ edit ]
 ^ ^{a} ^{b} ^{c} The term tritone is sometimes used more strictly as a synonym of augmented fourth (A4).
 ^ ^{a} ^{b} The perfect and the augmented unison are also known as perfect and augmented prime.
 ^ The minor second (m2) is sometimes called diatonic semitone, while the augmented unison (A1) is sometimes called chromatic semitone.
 ^ ^{a} ^{b} ^{c} ^{d} ^{e} ^{f} ^{g} The expression diatonic scale is herein strictly defined as a 7tone scale, which is either a sequence of successive natural notes (such as the Cmajor scale, C–D–E–F–G–A–B, or the Aminor scale, A–B–C–D–E–F–G) or any transposition thereof. In other words, a scale that can be written using seven consecutive notes without accidentals on a staff with a conventional key signature, or with no signature. This includes, for instance, the major and the natural minor scales, but does not include some other seventone scales, such as the melodic minor and the harmonic minor scales (see also Diatonic and chromatic).

^ ^{a} ^{b}
General rule 1 achieves consistency in the interpretation of symbols such as CM^{7}, Cm^{6}, and C+^{7}. Some musicians legitimately prefer to think that, in CM^{7}, M refers to the seventh, rather than to the third. This alternative approach is legitimate, as both the third and seventh are major, yet it is inconsistent, as a similar interpretation is impossible for Cm^{6} and C+^{7} (in Cm^{6}, m cannot possibly refer to the sixth, which is major by definition, and in C+^{7}, + cannot refer to the seventh, which is minor). Both approaches reveal only one of the intervals (M3 or M7), and require other rules to complete the task. Whatever is the decoding method, the result is the same (e.g., CM^{7} is always conventionally decoded as C–E–G–B, implying M3, P5, M7). The advantage of rule 1 is that it has no exceptions, which makes it the simplest possible approach to decode chord quality.
According to the two approaches, some may format the major seventh chord as CM^{7} (general rule 1: M refers to M3), and others as C^{M7} (alternative approach: M refers to M7). Fortunately, even C^{M7} becomes compatible with rule 1 if it is considered an abbreviation of CM^{M7}, in which the first M is omitted. The omitted M is the quality of the third, and is deduced according to rule 2 (see above), consistently with the interpretation of the plain symbol C, which by the same rule stands for CM.
 ^ All triads are tertian chords (chords defined by sequences of thirds), and a major third would produce in this case a nontertian chord. Namely, the diminished fifth spans 6 semitones from root, thus it may be decomposed into a sequence of two minor thirds, each spanning 3 semitones (m3 + m3), compatible with the definition of tertian chord. If a major third were used (4 semitones), this would entail a sequence containing a major second (M3 + M2 = 4 + 2 semitones = 6 semitones), which would not meet the definition of tertian chord.
References [ edit ]
 ^ Prout, Ebenezer (1903), "IIntroduction", Harmony, Its Theory and Practice (30th edition, revised and largely rewritten ed.), London: Augener; Boston: Boston Music Co., p. 1, ISBN 9780781207836
 ^ ^{a} ^{b} Lindley, Mark; Campbell, Murray; Greated, Clive. "Interval". In Deane L. Root (ed.). Grove Music Online. Oxford Music Online. Oxford University Press. (subscription required)
 ^ Aldwell, E; Schachter, C.; Cadwallader, A., "Part 1: The Primary Materials and Procedures, Unit 1", Harmony and Voice Leading (4th ed.), Schirmer, p. 8, ISBN 9780495189756
 ^ Duffin, Ross W. (2007), "3. Nonkeyboard tuning", How Equal Temperament Ruined Harmony (and Why You Should Care) (1st ed.), W. W. Norton, ISBN 9780393334203
 ^ ^{a} ^{b} ^{c} "Prime (ii). See Unison" (from Prime. Grove Music Online. Oxford University Press. Accessed August 2013. (subscription required))
 ^ ^{a} ^{b} Definition of Perfect consonance in Godfrey Weber's General music teacher, by Godfrey Weber, 1841.
 ^ Kostka, Stephen; Payne, Dorothy (2008). Tonal Harmony, p. 21. First Edition, 1984.
 ^ Prout, Ebenezer (1903). Harmony: Its Theory and Practice, 16th edition. London: Augener & Co. (facsimile reprint, St. Clair Shores, Mich.: Scholarly Press, 1970), p. 10. ISBN 0403003261.
 ^ See for example William Lovelock, The Rudiments of Music (New York: St Martin's Press; London: G. Bell, 1957):^{[page needed]}, reprinted 1966, 1970, and 1976 by G. Bell, 1971 by St Martins Press, 1981, 1984, and 1986 London: Bell & Hyman. ISBN 9780713507447 (pbk). ISBN 9781873497203
 ^ Drabkin, William (2001). "Fourth". The New Grove Dictionary of Music and Musicians, second edition, edited by Stanley Sadie and John Tyrrell. London: Macmillan Publishers.
 ^ Helmholtz, Hermann L. F. On the Sensations of Tone as a Theoretical Basis for the Theory of Music Second English Edition translated by Ellis, Alexander J. (1885) reprinted by Dover Publications with new introduction (1954) ISBN 0486607534, page 182d "Just as the coincidences of the two first upper partial tones led us to the natural consonances of the Octave and Fifth, the coincidences of higher upper partials would lead us to a further series of natural consonances."
 ^ ^{a} ^{b} ^{c} Cope, David (1997). Techniques of the Contemporary Composer, pp. 40–41. New York, New York: Schirmer Books. ISBN 0028647378.
 ^ ^{a} ^{b} Wyatt, Keith (1998). Harmony & Theory... Hal Leonard Corporation. p. 77. ISBN 0793579910.
 ^ ^{a} ^{b} Bonds, Mark Evan (2006). A History of Music in Western Culture, p.123. 2nd ed. ISBN 0131931040.
 ^ Aikin, Jim (2004). A Player's Guide to Chords and Harmony: Music Theory for RealWorld Musicians, p. 24. ISBN 0879307986.
 ^ Károlyi, Otto (1965), Introducing Music, p. 63. Hammondsworth (England), and New York: Penguin Books. ISBN 0140206590.
 ^ Hindemith, Paul (1934). The Craft of Musical Composition. New York: Associated Music Publishers. Cited in Cope (1997), p. 40–41.
 ^ Perle, George (1990). The Listening Composer, p. 21. California: University of California Press. ISBN 0520069919.
 ^ Gioseffo Zarlino, Le Istitutione harmoniche ... nelle quali, oltre le materie appartenenti alla musica, si trovano dichiarati molti luoghi di Poeti, d'Historici e di Filosofi, si come nel leggerle si potrà chiaramente vedere (Venice, 1558): 162.
 ^ J. F. Niermeyer, Mediae latinitatis lexicon minus: Lexique latin médiéval–français/anglais: A Medieval Latin–French/English Dictionary, abbreviationes et index fontium composuit C. van de Kieft, adiuvante G. S. M. M. LakeSchoonebeek (Leiden: E. J. Brill, 1976): 955. ISBN 9004047948.
 ^ Robert De Handlo: The Rules, and Johannes Hanboys, The Summa: A New Critical Text and Translation, edited and translated by Peter M. Lefferts. Greek & Latin Music Theory 7 (Lincoln: University of Nebraska Press, 1991): 193fn17. ISBN 0803279345.
 ^ Roeder, John. "Interval Class". In Deane L. Root (ed.). Grove Music Online. Oxford Music Online. Oxford University Press. (subscription required)
 ^ Lewin, David (1987). Generalized Musical Intervals and Transformations, for example sections 3.3.1 and 5.4.2. New Haven: Yale University Press. Reprinted Oxford University Press, 2007. ISBN 9780195317138
 ^ Ockelford, Adam (2005). Repetition in Music: Theoretical and Metatheoretical Perspectives, p. 7. ISBN 0754635732. "Lewin posits the notion of musical 'spaces' made up of elements between which we can intuit 'intervals'....Lewin gives a number of examples of musical spaces, including the diatonic gamut of pitches arranged in scalar order; the 12 pitch classes under equal temperament; a succession of timepoints pulsing at regular temporal distances one time unit apart; and a family of durations, each measuring a temporal span in time units....transformations of timbre are proposed that derive from changes in the spectrum of partials..."
External links [ edit ]
 Gardner, Carl E. (1912): Essentials of Music Theory, p. 38
 Encyclopædia Britannica, Interval
 Lissajous Curves: Interactive simulation of graphical representations of musical intervals, beats, interference, vibrating strings
 Elements of Harmony: Vertical Intervals
 Just intervals, from the unison to the octave, played on a drone note