The Book of Songs is the earliest collection of poems in China, with an income of about 500 years from the early years of the Western Zhou Dynasty to the middle of the Spring and Autumn Period (1 1 century to the 6th century). (There are also six poems with titles and no content, which are called sheng poems), also known as "Three Hundred Poems". In the pre-Qin period, they were called "poetry" or "poetry three" by integers. It is still in use today. In the Han Dynasty, Mao Heng and Li Mao annotated The Book of Songs, so it was also called Shi Mao. Most of the authors of the poems in The Book of Songs can't be verified. The area involved is mainly the Yellow River Basin, starting from Shanxi and eastern Gansu in the west, southwest Hebei Province in the north, Shandong Province in the east and Jianghan Basin in the south. Poetry and music are inseparable.