sugar pie honny bunch
that's true
A singing group of eight is called an octet.
What movie? Dreamgirls? If so Dreamgirls was inspired by real live group, The Supremes, who were a black girl singing group.
Quartet.
The song was called The Sly, Slick and The Wicked. It was performed by a group called, the Lost Generation. This tune was released in 1970.
A acapella 5 man singing group would be called a Barber shop choir.
Black Sabbath
A singing group of three is called a "trio."
Carolers.
The choir.
Trio
they started to sing in a group in 1998! HOW MARVELLOUS!