A quartet is a singing group of four.
A quartet
Harry styles he sing in a famous group called one direction with is 4 other group members Zayn, Niall, Louis, and Liam.....
A trio.
it's a group called THE REJECTZ
A capella
it was a duet group called ylvis
The group called Genesis.
All 4 of them
the group was called Camila...their song was called Entre Tus Alas ft. Colbie Caillat
A Group called the TYMES.
Mount Rushmore! :)
Mah Sing Group was created in 1965.
mindless behaver is boy group there r 4 of them and they sing the song my girl loves me