Intervals

Interval Quality
The first word in describing an interval is one of these five: Major, Minor, Perfect, Augmented, Diminished. Each quality may be abbreviated as follows:

M = major, m = minor, P = perfect,  + augmented,  – diminished
DEFINITIONS
Major intervals are 1/2-step larger than minor intervals. Augmented intervals are 1/2-step larger than major or perfect intervals. Diminished intervals are 1/2-step smaller than minor or perfect intervals.
WORD MATCHING
The quality of an interval depends on its numeric value. Any interval may be diminished or augmented but only 2nds, 3rds, 6ths, and 7ths may be minor or major. Likewise unisons, octaves, 4ths, and 5ths are the only intervals that can be perfect.

13 EQUALS 6?
Intervals over an octave share the same qualities as those an octave smaller. To reduce an interval by an octave, subtract 7. A 12th can be perfect since it reduces to a 5th.
TRITONE
The interval of 1/2-octave is often called a tritone.
From fa up to ti it is an augmented fourth (+4).
Inverted (ti up to fa) it is a diminished fifth (-5).

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INTERVALS IN THE SCALE

INVERSIONS
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