What was poetry in ancient times? What is a song?

Poetry is a literary genre, which expresses social life and people's spiritual world with concise language, rich emotions and rich phenomena according to the requirements of certain syllables, tones and rhythms. In ancient China, unhappy people were called poems and happy people were called songs. In the early days, poetry, song, music and dance were integrated. Poetry is the lyrics, which are always sung with music and dance in actual performances. Later, poetry, song, music and dance developed independently and became independent adults. Poems and songs are collectively called poems. Poetry is a highly concentrated literary genre that reflects social life. Full of the author's thoughts and feelings and rich imagination. Its language is concise and vivid, with distinct rhythm, harmonious rhyme and rich musical beauty. The sentences are generally in rows and pay attention to the beauty of structural form.