#rock_'n'_roll__rock'n'roll__rockandroll__rockandroll__rock_music  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."
  supertype:  #popular_music_genre__popularmusicgenre__popular_music__popularmusic  any genre of music having wide appeal (but usually only for a short time)
  subtype:  #progressive_rock  #psychedlic_rock  #punk_rock
  part:  #backbeat  (rock music) a loud steady beat

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