The Pentatonic Scale 五声音阶

The Pentatonic Scale 五声音阶
Traditional Chinese Musical Instruments 中国传统乐器（肖迪编著）
The pentatonic (five-sound) scale was the mode basis of ancient Chinese music. The five scales are marked as Gong, Shang, Jue, Zhi, and Yu, in equivalence to the scales of C, D, E, G and A in modern music. Its feature lies in the lack of chromatic (minor second) intervals; hence it is also called the "whole-tone pentatonic scale". In this five-sound scale, each sound can act as the key note to build up the mode; therefore, there are five different modes.
In the period before Qin Dynasty (221 B.C.-206 B.C.), the Round Earth Chapter of Guan Zi formally recorded the mathematic method, historically known as San Fen Sun Yi Fa (the method of one-third addition or detraction), to calculate the proportional cord length of each of the five sounds, and also had a full description for the names of the five sounds.

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