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Encyclopedia of Microtonal Music Theory

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twelfth / 12th / diatonic-12th

[Joe Monzo]

A diatonic interval which traverses 11 steps in a diatonic scale, and covers a pitch distance bounded by 12 nominals inclusively, an octave plus a 5th. This refers to the generic usage of "12th" without a qualifying adjective, which often precedes the interval name in standard diatonic usage. Thus, the various different types of diatonic 12ths are (in order of size from smallest to largest):

The use of "12th" alone, without a qualifier, generally refers specifically to the perfect-12th.

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