I also asked what green and yellow meant.

The earliest meaning of "I once asked Huang Qing" refers to spring, summer, autumn and winter, and time flies, from Han Shu Li Lezhi. Yan Shigu's Note: "Green and yellow are the joy of the four seasons.

Rites and Music is an article in Hanshu, which mainly introduces the rites and music system in the Western Han Dynasty. The writer is Ban Gu.

This book discusses the nature and history of ceremonies and music.

Historical Records contains two books, Rites and Music, or there are no books in the original text, which is supplemented by Mr. Chu.

Or think that part of this book was written by Sima Qian.

There are similarities and differences between this book and the two books on rites and music in Historical Records, and the content is much richer.

First of all, it talks about "the use of rites and music", saying that "the works of rites and music are like heaven and earth, so we can understand the gods, establish human relations and save everything", and emphasize the important significance and universal role of rites and music.

Among them, in the part of ceremony, it describes in detail the changes of ancient etiquette system, Jia Yi, Dong Zhongshu, Wang Ji and Liu Xiang's suggestions on the etiquette system in the Han Dynasty, and the "rudeness without joy" in the Eastern Han Dynasty.

In the music part, the changes of ancient music are described in detail, and it is written that the ancestral music in Shu was made by Qin musicians in the early Han Dynasty, and the ancestral music in Han Dynasty was "mostly due to the past of Qin".