In the course of thousands of years of civilization, the Chinese nation not only created rich and colorful categories and varieties of traditional music, but also carried out philosophical speculation and theoretical discussion on the basis of music art practice, and successively produced voluminous works on music theory. According to legend, Confucius edited the ancient classic Six Classics, and Yue Jing was one of them. There is a chapter of "Da Si Le" in the Book of Rites and a chapter of "Le Ji" in the Book of Rites. Mozi once wrote Fei Yue, and Xun Kuang once wrote Yue Lun. Since then, officials of various generations have also studied music laws, and more chapters on Le Shu, Music Records and Music Studies have been written in historical records. The works on music theory and music laws of scholars and bachelors have also emerged constantly, some of which have been circulated to this day, and some of them have high academic standards and research value. This is an extremely valuable heritage of traditional music theory.

Yue Lun is a theoretical work on music sociology, music aesthetics and music performance, with many titles, among which there are many excellent works with profound thoughts, such as Yue Lun, Yue Ji, No Sorrow in Sound, Singing Lun, Huoshan Qinkuang and so on.

Yue Lun and Yue Ji are works of sociology of music. "On Music" is a collection of music speeches by Xun Kuang (BC 313 ~ BC 238), a thinker in the late Warring States period, compiled by his disciples. The Book of Music is preserved in the Book of Rites and Historical Records, and the Book of Rites is entitled "The Nineteenth Book of Music". The title of Historical Records is "Le Shu II", but the author and the date of writing are still inconclusive. In history, there are two theories, namely, Liu De, the king of Hejian in the Western Han Dynasty (History of Han Dynasty, Art and Literature) and Gongsun Nizi in the Warring States Period (Music of Sui Shu). These two books focus on the musical thoughts of the Confucian school, and most of them are related to the sociology of music. The main points are:

The process of music production and formation. "Fan Yin, born by the heart, the heart, things make it natural. Feeling moves by things, so it is shaped by sound. The sound is corresponding, so it changes and becomes a square, which is called the sound. It's fun to compare the sound and dry the feathers, which is called joy "(Le Ji). This points out that music comes from people's feelings, and people's emotional changes are the result of objective things. When people are excited by foreign objects, it is manifested as "sound". When the changes of "sound" are organized, it becomes "sound". When "sound" is played and sung according to certain rules, and dance is added, it becomes "music". At the same time, it is also put forward that "a song is also a speech, and a long speech is also a speech", "If a long speech is insufficient, it will be lamented, and if it is insufficient, it will be a dance without knowing what to do" (Le Ji). This outlines the formation process of "music".