Four-character rhymes and parallelism sentences are mainly used for rhyming, but there are also rich changes. There are two characters, three characters, five characters, six characters, seven characters, eight characters and so on, which are flexible and changeable.
The Book of Songs was written in the Spring and Autumn Period, and was taught by Qi (Shen Pei), Lu (Mao Heng), Han (Han Ying) and Mao (Zhao Renmao) in the Han Dynasty. After the Eastern Han Dynasty, Qi, Lu and Han were all lost, leaving only the Biography of Mao Poetry. Mao poetry prevailed after the Eastern Han Dynasty and has been passed down to this day.
Historical and folk values
Judging from the value of historical materials, The Book of Songs actually comprehensively reflects the history of the Western Zhou Dynasty and the Spring and Autumn Period, and records the historical development and realistic situation from the Western Zhou Dynasty to the Spring and Autumn Period in all directions, covering almost all aspects of society-politics, economy, military, folk customs, culture, literature, art and so on.
When describing this historical stage, a considerable part of the history books of later historians are based on the records of the Book of Songs. For example, epics such as "People's Life" in "Daya" are ancestor worship poems, which record the history of Zhou from the late matriarchal society to the destruction of the Shang Dynasty and the founding of the People's Republic of China, and praise the brilliant achievements of Hou Ji, Gong Liu, Wang Ji and so on.
The historical value of these poems is obvious. They recorded the emergence and development of the Zhou Dynasty, the historical process of the demise of the Shang Dynasty, the establishment of the Zhou Dynasty and the unification of the world, as well as the great migration and great war in this historical development process, reflecting the political, economic, folk-custom and military aspects of the Zhou Dynasty and leaving valuable historical materials for future generations. Although these historical materials are mixed with myths, there are undeniable historical facts that can be trusted.