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| Indexed interval notation is a notation for [[just intonation]] in which all intervals are represented by a normal interval classification combined with a ordinal number or index. An index of 1 is used for the simplest interval in an interval class (such as [[6/5]] for minor thirds), an index of 2 is used for the second-simplest, an index of 3 is used for the third-simplest, and so on.
| | #redirect [[User:CompactStar/Lefts and rights notation]] |
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| == Definition ==
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| To get the classification for an interval, multiply the interval classes of the prime harmonics which it factors into, which are predefined as follows:
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| {|class="wikitable"
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| |-
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| !Prime harmonic
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| !colspan="2"|Interval classification
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| |-
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| |[[2/1]]
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| |P8
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| |perfect octave
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| |-
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| |[[3/2]]
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| |P5
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| |perfect fifth
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| |-
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| |[[5/4]]
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| |M3
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| |major third
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| |-
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| |[[7/4]]
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| |m7
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| |minor seventh
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| |-
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| |[[11/8]]
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| |P4
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| |perfect fourth
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| |-
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| |[[13/8]]
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| |m6
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| |minor sixth
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| |-
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| |[[17/16]]
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| |m2
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| |minor second
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| |-
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| |[[19/16]]
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| |m3
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| |minor third
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| |-
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| |[[23/16]]
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| |A4
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| |augmented fourth
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| |-
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| |[[29/16]]
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| |m7
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| |minor seventh
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| |-
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| |[[31/16]]
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| |P8
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| |perfect octave
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| |-
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| |}
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