One main part.

Two main parts.

Three main parts.

A vocal ensemble in a musical, opera or oratorio.

Singing without any instrumental backing or accompaniment.

Group of four strings instruments – two violins, a viola and a cello.

Large instrumental ensemble which has four families of instruments: string, woodwind, brass and percussion.

The name given to the continuous bass line in Baroque music often played by the harpsichord and the cello.

Part of a pop or jazz group that supplies the rhythm, i.e. bass, drums and guitar/keyboard (playing the chords).

Small ensemble that performs rock/pop music. A common line-up would be lead guitar, rhythm guitar (one or both also doing vocals), bass guitar and a drummer.