A old(is there any other kind) C64 Game. A Side scrolling shoot 'em up that allowed the player to select a character from a choice of 4. AFAIK it was 2 player on the C64. But I believe it was an arcade game before that and may have had more players.

Quar*tet", Quar*tette" (?), n. [It. quartetto, dim. of quarto the fourth, a fourth part, fr. L. quartus the fourth. See Quart.]

1. Mus. (a)

A composition in four parts, each performed by a single voice or instrument.

The set of four person who perform a piece of music in four parts.

2. Poet.

A stanza of four lines.

© Webster 1913.