two people singing together is a duet
Quartet
they rub their knees together they use this as a mating call
they rub their knees together they use this as a mating call
Trio
a choir
People chosen to sing together are often referred to as a "choir" or "chorus." This group can vary in size and may perform a wide range of musical genres, from classical to contemporary. In some cases, smaller ensembles within a choir, such as quartets or vocal groups, may be formed for specific performances.
A chorus or choral! A choir.
It's a trio
Christmas carolers
The composer puts together musics for people to sing or play on instruments.
Drama Club Glee Club
A Choir is a group of people who sing peaceful non vilent songs together.