This can be regarded as a problem related to the traditional Chinese music mode. Many different musical modes have existed at different times in history.

Gong, Shang, Jiao, Zheng and Yu are generally called Zhengyin. A semitone higher than the regular tone is "clear", and the modern notation is #. A semitone lower than the correct sound is called "change", which is b. A whole tone lower than the correct tone is called "leap", and the contemporary notation is bb (double flat mark). Scales other than these tones are called partial tones. Commonly used partial sounds include: Qing Jiao, Bian Zheng, Bian Gong, Lean Shang, Lean Gong, etc.

If a piece of music only contains the five correct tones of Gong Shang Jiao Zheng Yu, it is a pentatonic mode. If one partial tone is added to the pentatonic mode composed of the positive tone, it forms a six-tone mode, and if two partial tones are added, it can be combined into a seven-tone mode.

In the seven-tone modes of traditional Chinese music theory, only the main tone can be the main tone, and the partial tone cannot be the main tone. The most commonly used seven-tone modes are: Qingyue mode, Yayue mode, and Yanyue mode. , a combination of three types of modes and five correct tones in the seven-tone mode. There are actually fifteen kinds of seven-tone mode.

Take the Qingyue Gong mode as an example. The scales are: Gong, Shang, Jiao, Qingjiao, Zheng, Yu, and Biangong, which respectively approximately correspond to 1, 2, and 3 of the natural major mode of Western music. 4, 5, 6, 7.

Take the Yale Palace mode as an example. The scales include: Gong, Shang, Jiao, Bian Zheng, Zheng, Yu, Bian Gong, and Gong, which approximately correspond to 1, 2, 3, and # respectively. 4, 5, 6, 7.

No examples will be given for other modes. . . Too many. If you are interested, you can look for books on ancient Chinese music theory to study.

In short, China has a very long history of music development. As early as 8,000 years ago, the bone flute at the Jiahu site in Wuyang County, Henan Province was able to produce a seven-tone scale. There are countless music theories such as Erlu and Lu's twenty-eight modes, rotating palace modulations and so on.