In Yuefu poems, there is a kind of songs named after songs, such as Chu Yinfei, Elegance, Wu Dongyin, Fu Liangyin and Baitou Yin. This kind of music falls into the following categories:
First, it originated from the elegy of Wei and Jin Dynasties. Chu and Daya sounds are this type. This type of song comes from Song Dan, which is a cantata.
Secondly, it comes from the tones in harmony music. Represented the local music style of Shandong in Wei and Jin Dynasties. Wu Dong Yin, Fu Liang Yin and Bald Yin all belong to this category.