I-scale subtraction of the difference between two or four spectra

Miyachi notation is one of the traditional folk notation in China, which is named after the name of the volume with the words labor and ruler written on it.

Si Er score is a string instrument score popular in Chaoshan, Guangdong and Zhangzhou, Fujian. This is an ancient string symbol. Using seven numbers, such as two, three, four, five, six, seven and eight, to represent the chord position of an instrument, and using two or four characters as pronouns, is called Si Er notation.

Subtraction spectrum, also known as fingering spectrum, is a notation commonly used in China Chinese Guqin, which is characterized by memorizing finger positions and playing techniques with left and right hands. Because it is a combination of fingering and guqin terms, it is named subtraction spectrum.