Books and records of ancient ballads

Ancient ballads are scattered in ancient books of the pre-Qin and Han dynasties, and later generations have concentrated versions: the source of ancient poems in the Qing Dynasty, and the poems of the pre-Qin and Han Dynasties, Wei, Jin, Southern and Northern Dynasties written by Kai today are the most detailed. However, this is not entirely credible. Among them, Song of Breaking the Earth, Song of Qingyun and Song of Nanfeng are all under the disguise of later generations.