It is reciting, often said to be reciting poetry. Because ancient poetry is meant to be sung, the author will play with it, recite it, and revise it until he is satisfied.
Dongpo said in Yutang that there was a minister who was good at praising, because he asked: "How can my words be as good as Liu Qi?" The girl, holding a red pipa, sings "The dawn wind wanes on the bank of the willows"; the bachelor's poem requires a big man from Guanxi, a copper pipa, and an iron pipa, singing "The great river goes eastward".
(Song Dynasty Yu Wenbao's "Sword Blowing Record")
It can be seen from this that the Book of Songs and Han Fu, especially after being modified by the palace music officials, should be matched with rhythm.