Sing-along
（重定向自Community singing）
Sing-along, also called community singing or group singing, is an event of singing together at gatherings or parties, less formally than choir singing. One can use a songbook. Common genres are folk songs, patriotic songs, hymns and drinking songs. Children across the world usually sing nursery rhymes together. Sing-along can be based on unison singing, or on singing in harmony (different parts).