First of all, the tone of the song is seven basic tones, namely, C, D, E, F, G, A and B, that is, 1234567, instead of ABCDEFG, and there are five high-pitched # C, # D, # F, # G and # A. If they are in the same octave, of course, C is the lowest and B is the highest.

in an octave, b is the highest and c is the lowest. But it is not an octave, which means that there is no way to compare it in different intervals. For example, on the keyboard of a piano, there are a high-pitched area and a low-pitched area, and any note in the high-pitched area will be higher than that in the low-pitched area. The structural form of

tone focuses on the specification of the interval relationship between the tones in the tone series.

Each tone in a scale can be used as the tonic to establish a mode, which can form seven different natural modes of seven tones.

Tone is mainly determined by the frequency of sound, and it is also related to the sound intensity.

CDEFGAB is a sound name, and doremifasollasi is a roll name. There are 12 sound names, 7 full tones are CDEFGAB, and 5 semitones are # c, # d, # f, # g and # a. The fixed roll name method is used in the staff, and the sound names are read directly when reading the music.

Extended information:

The name of the key is based on the tonic. For example, the key that is arranged in order from C by seven natural tones is C, and moving C up by a pure fifth is G with G as the main tone. Moving c down by a pure fifth is the f key with f as the main tone.

Generally, different tunes are distinguished by the key signature marked after the clef at the beginning of the score, and different modes are the specific forms used in music works.

Generally speaking, any key includes a major with the same name and parallel minor of this major.

Besides, a key can also include some other modes that are not commonly used. For example, the medieval mode in medieval Europe, zd and the national modes in other countries, such as the traditional five-tone mode in China.