It's called a Quartet. :D
A quartet is a singing group of four.
Its a Quartet
A group of four people singing is called a quartet.
Quartet.
The noun for a four person singing group or musicians is a quartet.
Quintuplets are a group of five. A quartet is a group of four. The quartet usually applies to a group of musicians, singing or otherwise. Quintuplets are when five babies are born at same time; like twins, except that there are five instead of two.
The Oak Ridge Boys are a singing group that was popular during the 1950's. They are an American country and gospel vocal quartet.
A group of four musicians or singers are called a quartet. A group of five musicians or singers are called a quintet.
Quartet or Foursome.
An ensemble, a choir, a group, or a specific name based on the number (a quartet is with 4 people (also known as a Barbershop Quartet), a quintet with 5, septet with 7 etc.).
In music, a quartet is an ensemble of four singers or instrumental performers. In pop music they would be a "group".