The relationship between two pitch levels is the interval relationship, and its unit name is called degree.

For example, the fourth degree refers to the four natural sound names calculated from this sound. For example, the degree algorithm between DO and FA is the four natural sound names of DO, RE, MI, and FA, so DO The interval relationship between FA and FA is fourth.

After determining the degree of this group of sounds, you must add adjectives such as big, small, increasing, and decreasing in front of the degree to further determine the correct interval of this group of sounds. The names of common intervals:

Distance 0 semitones: pure one degree

Distance 1 semitone: minor second (MI / FA), augmented degree (DO / #DO)

Distance 2 semitones: major second (DO/RE), diminished third (#RE/FA)

3 semitones away: minor third, augmented second

4 semitones apart Semitone: major third, diminished fourth

5 semitones away: perfect fourth

6 semitones apart: augmented fourth, diminished fifth

7 semitones away: perfect fifth

8 semitones away: minor sixth

9 semitones away: major sixth

10 semitones away: Minor seventh

11 semitones away: major seventh

12 semitones away: pure octave

Extended information:

Semitone and whole tone

A semitone composed of two adjacent pitch levels is called a natural semitone. Natural semitones can be formed from basic pitch levels, varying pitch levels, or basic pitch levels and varying pitch levels. ?

The whole tone formed by two adjacent tone levels is called a natural whole tone. Natural whole tones, like natural semitones, can be formed from the basic tone level, the varying tone level, or the basic tone level changing the tone level. A semitone composed of two different forms of the same pitch is called a modified semitone.

Variated semitones can be formed by basic pitches and varying pitches, or by varying pitches. A whole tone composed of two different forms of the same tone level or separated by one tone level is called a modified whole tone. A modified whole tone can be formed by a basic tone level and a changing tone level, or it can also be formed by a changing tone level and a changing tone level.

Baidu Encyclopedia—Music Theory