If it is: the interval is perfect (if it is a unison, fourth, fifth, or octave) or it is major (if it is a second, third, sixth, or seventh). If it is not: then, for now, the interval is minor (a lowered second, third, sixth, or seventh).

Can perfect intervals be major or minor?

Remember that perfect intervals (unisons, fourths, fifths, and octaves) can never be major or minor, and major and minor intervals (seconds, thirds, sixths, and sevenths) can never be perfect in quality. However, any size of interval can be augmented or diminished.

How do you know if a interval is major or minor?

Determine if the upper note is in the major scale. If it is not, determine if the interval is a half step smaller than a major interval, in which case it is a minor interval. If the lower note of an interval has a sharp or flat on it, cover up the accidental, determine the interval, then factor the accidental back in.