What is a poem? What is the reason?

Up to now, the Book of Songs has actually preserved 305 poems, but the title is 3 1 1. Because Xiaoya has six articles, such as Nanchang, Bai Hua, Shu Hua, You Geng, Chong Qiu and You Yi. Later generations will refer to these six poems as "six-tone poems" or "tone poems" for short. There are two main theories about the causes of "vocal poetry". First, the Han people's theory of "righteous words", that is, these poems originally had words, but later they died and were lost. The second is the Song people's theory of "speaking without words". Song people didn't believe what the Han people said and refuted it in many ways. For example, Wang Zhi said in "A Summary of Poems": "Shi Mao didn't know how to play a song, but he gave an overview. Those with high singing rate have words and tones. Those who have voices, those who are in charge, and those who have no words are also. In the afterlife, there are still sixty-three songs in the Tang Dynasty.