Source : WordNet®

rock music
     n : 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}]