1. The classical music in ancient China is pentatonic. In the Zhou Dynasty, "Fa" and "Si" were added to form a seven-tone scale, because at that time, the "three-point profit and loss method" had been perfected day by day, and the five-tone twelve laws were used in practical music activities.

Five tones: Gong, Shang, Jiao, Wei and Yu are approximately equal to the simple notation: 1, 2, 3, 5 and 6

The twelve laws are further divided into:

-Six Laws of Yang Sheng-Huang Zhong and Tai Cong are approximately equal to the simple notation-1 and 2; Gu Xi, Yan Bin, Lei Ze, no shooting. 3, #4, #5,

Wow Ling Gao Gu Fu Ge Shuan Gong Jing-Yin Sheng Liu Lv-Lin Zhong, Nan Lv, about equal to the simple notation-5, 6; Ying Zhong, Da Lv, Jia Zhong, Zhong Lv. 7、#1、！ 2, 3

-Seven Laws: musical notation of Gong, Shang and Jiao: 1, 2 and 3; Change emblem, emblem, feather, palace and palace. 4、5、6、7