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Encyclopedia of Microtonal Music Theory

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[Joe Monzo]

Two tetrachords whose extremal tones are separated by a gap in pitch are considered to be not linked and are "disjunct."

In ancient Greek theory the gap was typically a whole-tone of 9:8 ratio (~204 cents, called the "tone of disjunction".

Scales, modes, and harmoniai containing disjunct tetrachords are also called disjunct.

See Greater Perfect System for more examples.

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