Since the Han Dynasty, Confucianism has regarded it as a classic, so it is also called the Book of Songs. The formal use of the Book of Songs should begin in the early years of the Southern Song Dynasty. There were many early versions of The Book of Songs, the most famous of which was the Book of Songs annotated by Mao Heng of Lu State and Mao Ji of Han Dynasty, so this version was also called Shi Mao. Most of the authors of the poems in The Book of Songs cannot be verified.
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Regarding the classification of poems in The Book of Songs, there is a saying of "four beginnings and six meanings". "Four Beginnings" refers to four top poems: Feng, Elegance, Ode. "Six meanings" refers to "wind, elegance, praise, fu, comparison and glory". "Style, elegance and praise" are the classification of the Book of Songs according to different music, and "Fu, Bi and Xing" are the expressions of the Book of Songs.
"Fu, Bi, Xing" is the expression of The Book of Songs. "Fu" means "telling the truth", which is directly related to Chen Qi. Describing the course of a thing (direct narration) is generally found in Fu and Ya.
"Bi" refers to "supporting things to simulate the environment", which is a metaphor. One thing is compared with another (metaphor), such as "Zhi Feng Xiang Mouse" and "Feng Weishuo Mouse", which is a metaphor for the greedy and hateful mouse of the ruler. "Xing" means "supporting things to make them excited", which is the association from one thing to another.
Baidu Encyclopedia-The Book of Songs