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Encyclopedia of Microtonal Music Theory

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imperfect

[Joe Monzo]

A type of diatonic interval which comes in two basic sizes, either major (big) or minor (small) -- as opposed to perfect, which is a type of interval with only one basic size.

In traditional diatonic music, the imperfect intervals are the 2nds, the 3rds, the 6ths, and the 7ths, and also the 9ths (8ve + 2nd), 10ths (8ve + 3rd), and 13ths (8ve + 6th).

If a major interval is widened by a chromatic semitone, it becomes augmented; if it is narrowed by a chromatic semitone, it becomes minor.

If a minor interval is narrowed by a chromatic semitone, it becomes diminished; if it is widened by a chromatic semitone, it becomes major.

If any imperfect interval is widened or narrowed by a diatonic semitone, the nominal changes and thus it becomes a different interval.

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