From low to high: C, D, E, F, G, A, B.

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C, D, E, F, G, A, and B are the seven basic scales in the music system. They are also the arrangement of musical instruments from low to high. The natural heptatonic scale.

The natural heptatonic scale is the most widely used heptatonic scale. Its interval organization is that there are 5 whole tones in each octave, which are divided into two series and three series. separated by semitones.

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Add first line, second line, third line, and fourth line to the top of the treble staff, which are la, do, mi, and sol respectively, and add copy first line, second line, third line, and fourth line to the bottom. They are do, la, fa and re respectively.

The first, second, third and fourth lines on the bass staff are do, mi, sol and xi respectively, and the first, second, third and fourth lines on the bottom are mi, do, la and fa respectively.

Every hundred lines of the staff and the spaces between the lines are called line 1, line 2, line 3, line 4, line 5 and line respectively from bottom to top. Room 1, Room 2, Room 3, Room 4.

The plus line and the plus space are respectively called the top plus 1st line, the top plus 1st space; the bottom plus 1st line, the bottom plus 1st space, etc., each representing a sound level. The fixed height of these steps is determined by the clef used.