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Encyclopedia of Microtonal Music Theory

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minor-6th / minor sixth / min6 / m6

[Joe Monzo]

The smaller of the two diatonic intervals which encompass 6 degrees of the of the diatonic scale. The minor-6th is composed of 3 tones (i.e., whole-tones) and 2 diatonic semitones, and is one chromatic semitone smaller than the major-6th.

           ____ minor-6th _____
          |                    |
C    D    E  F    G    A    B  C
           s   t    t     t  s
          m2  M2   M2    M2 m2

minor-6th   =   3t    + 2s     =   3(t-s) + 5s
            =   3(M2) + 2(m2)  =   3(+1)  + 5(m2)

Thus, the minor-6th contains 3 chromatic semitones and 5 diatonic semitones (or equivalently, 3 augmented-primes and 5 minor-2nds). In 12-edo, the minor-6th encompasses 8 equal semitones.

Narrowing the minor-6th by one more chromatic semitone results in the diminished-6th.

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