Understanding of the theme change of Han Yuefu's poems

This should be analyzed according to the author.

The suburban temple fu created by noble literati is used to worship heaven and earth, ancestral temple, Tang Ming and the country. There are Song of Sacrificing the Suburb and Song of Anshifang, as well as Song of Yanshe for court banquets. Dance music, elegant dance, miscellaneous dance and elegant dance are used in suburban temples, while Yan Yan and miscellaneous dance are used for banquets. At first, people just recited it at will, and then gradually used it as an orchestral tune, that is, harmony and rising tone, which originated from harmony and three tones. The content is mostly miscellaneous songs that reflect people's life, thoughts and feelings at that time, such as expressing their feelings, making banquets, expressing their grievances, saying that it is a war, or because of the old Buddha, or because of barbarians, so it is called miscellaneous songs.

The themes of Yuefu poems in Han Dynasty mostly reflect the pain of war, corvee and poverty.