Asked • 04/19/19

Term for distinguishing dim/perfect/aug intervals from dim/min/maj/aug ones?

There are two types of intervals, distinguished by their possible qualities: - Unisons, fourths, fifths, and octaves (and their compound variants) may be of perfect or (multiply) diminished/augmented quality - Seconds, thirds, sixths, and sevenths (and their compound variants) may be of minor, major, or (multiply) diminished/augmented quality Is there an established term for distinguishing these two categories? Something like "a fifth is a *foobarian* interval, so its quality cannot be minor". If there is no established term, what would be a good choice? <sup>Background: I'm writing some music software and this distinction comes up a lot in my code so I'd like to use the appropriate terminology.</sup>

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