#concept_album__conceptalbum  an album whose recording are unified by some theme (instrumental or lyrical or narrative or compositional)
  supertype:  #record_album__album  one or more recordings issued together; originally released on 12-inch phonograph records (usually with attractive record covers) and later on cassette audio tape and compact disc
  subtype:  #rock_opera  albums of rock music that aspired to the status of art; first appeared in the 1960s
  subtype:  #tribute_album__tributealbum__benefit_album__benefitalbum  concept album compiling a performer's work or work supporting some worthy cause

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