Interval is the distance between two tones (their pitches). Intervals can be:
Interval names are derived from the distance to the first degree of major scale:
To specify intervals more precisely we use one of these interval qualities: perfect (P), major (M), minor (m), diminished (d) or augmented (A).
A unison, fourth, fifth, and octave can be perfect. Other intervals (second, third, sixth and seventh) can be either major or minor. In the ascending major scale are only perfect and major intevals (as distance from the first degree)
A minor interval (m) is one semitone smaller than a major interval (M).
An augmented interval (A) is one semitone larger than a major or perfect interval (P). A diminished interval (d) is one semitone smaller than a minor or perfect interval (P).
These are the most common intervals (ST = number of semitones):
Practice key signatures in our