Answer:

quartets

Answer	Crossword Clue
QUARTETS	Sets of four
QUARTETS	Boyz II Men and others
QUARTETS	ABBA and Kiss

QUARTETS	String groups
QUARTETS	Foursomes
QUARTETS	Musical groups.
QUARTETS	Certain musical works
QUARTETS	Pieces of eight?
QUARTETS	The Beatles and the Monkees
QUARTETS	68 works of Haydn

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.