The difference between the pure octave and the major sixth is three semitones. A pure octave is a type of musical interval. It is composed of two notes with the same name but from different ranges. It has twelve semitones and the number of notes is 6. The major sixth interval is an octave that contains six It has nine semitones, and the number of notes is 4 and 1/2 sixth intervals.

1. The major sixth is a term for "interval" in music theory. In the natural pitch scale, 1 to 6, 2 to 7, 4 to treble 2, and 5 to treble three are the major six. degrees, and 3 to high 1, 7 to high 5, 6 to high 4 are minor sixths.

2. Pure octave is a single interval. The understanding of a single interval is relatively simple. If the two tones that constitute an interval are within a pure octave (including the pure octave), it is called a "single interval". For example, major third, pure octave, augmented second, minor seventh, etc. are one of the natural intervals.