Sing-along

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).

Among animals

Group vocalizing is known from several animal species. For example, a lion pride and a pack of wolves are known to vocalize together (supposedly to defend their territory), although scholars do not characterize their vocalizations as "singing". Gibbons sing in family groups (couples sing together, sometimes with their offspring)

In human pre-history

Singing in groups is one of the universal features of human musical cultures, and group singing has been often suggested as the primary form of the early human musical activity. It has been suggested that human group singing was primarily promoting the cohesiveness within human groups, and was possibly used to defend human groups from predators and competitors