#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)
  part:  #backbeat
  subtype:  #progressive_rock__progressiverock__artrock  a style of rock music that emerged in the 1970s; associated with attempts to combine rock with jazz and other forms; intended for listening and not dancing
  subtype:  #psychedlic_rock__acid_rock  a musical style that emerged in the mid-1960s; rock music inspired by or related to drug-induced experience
  subtype:  #punk_rock__punk  rock music with deliberately offensive lyrics expressing anger and social alienation; in part a reaction against progressive rock

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