INTERVALS

CONTENT

1. Perfect Interval
2. Augmented Interval
3. Diminished Interval

Perfect Intervals

There are four types of perfect intervals. These include unison, fourth, fifth, octave (eight).

Perfect Unison:

This is also called ‘prime’ interval. The notes of a unison are at one place, either on a line or a space on the stave. It does not contain any semitone. In a vocal music, two or more parts may be sounding the same note at the same time as unison.

Perfect Fourth (4^th):

A perfect fourth contains five semitones. In a perfect 4^th, four letter names are involved, e.g. C – F involves C, D, E, F.

All 4ths are perfect except one. The interval of 4^th between F – B is more than a perfect 4^th by a semitone. It contains six semitones instead of five. Thus, it is an augmented 4^th. It is also called “ tritone” Because it contains three whole tones, e.g.