User:CompactStar/Ordinal interval notation
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'Lefts and rights notation is a notation for just intonation
To get the classification for an interval, multiply the interval classes of the prime harmonics which it factors into, which are predefined as follows:
| Prime harmonic | Interval classification | ||
|---|---|---|---|
| 2/1 | P8 | perfect octave | C |
| 3/2 | P5 | perfect fifth | G |
| 5/4 | M3 | major third | E |
| 7/4 | m7 | minor seventh | Bb |
| 11/8 | P4 | perfect fourth | F |
| 13/8 | m6 | minor sixth | Ab |
| 17/16 | m2 | minor second | Db |
| 19/16 | m3 | minor third | Eb |
| 23/16 | A4 | augmented fourth | F# |
| 29/16 | m7 | minor seventh | Bb |
| 31/16 | P8 | perfect octave | C |