Simply put, in music, a note is called a degree. In the scale 1234567, 1 to 2 is the second degree (there are sophomores and juniors), 1 to 3 is the third degree, 1 to 7 is the seventh degree, from alto 1 to treble 65438. Then we can say that the treble 1 is an octave higher than the alto 1. This means that "one voice is eight pitches higher than the other".

Extended data

? ‖ ∮

I (#)，I (B)，I (×)，I (bb)，(⌒)，I(。 ), I(∞), I (||), I (double vertical lines), I (||), I (:| |), and I are marked repeatedly.

1: A semitone sign (#) indicates that the basic volume is raised by semitone.

2: The falling tone symbol (b) indicates that the basic sound level is lowered by a semitone.

3: The double rising sign (×) indicates that the basic sound level is raised by two semitones (a whole tone).

4: Re-scaling (bb) means that the basic sound level is reduced by two semitones (one whole tone).

5: The lowering mark (ヰ) indicates that the raised or lowered sound is lowered.

Baidu Encyclopedia: music notation