'rock music' definitions:

Definition of 'rock music'

(from WordNet)
noun
A genre of popular music originating in the 1950s; a blend of black rhythm-and-blues with white country-and-western; "rock is a generic term for the range of styles that evolved out of rock'n'roll." [syn: rock 'n' roll, rock'n'roll, rock-and-roll, rock and roll, rock, rock music]