"Clover Productions." . . . . . "DVD-Video discs"@en . . . . . . . . "Don't knock the rock"@en . "Don't knock the rock" . . . . "Principally a series of musical performances featuring jitterbug dancing with a plot involving parents disliking rock and roll." . . "Rock films"@en . "Drama"@en . . . . . . . . . . . . . "A rock and roller is out to prove that rock 'n' roll is not dangerous."@en . . . . . . "Feature films"@en . . . . . "A disc jockey tries to prove to teenagers' parents that rock 'n' roll is harmless and won't turn their kids into juvenile delinquents."@en . "DVDs"@en . . . . . "Columbia Pictures presents Bill Haley and his Comets in Don't knock the rock" . . . . . . . . "Musical films"@en . . "Video recordings for the hearing impaired"@en . . . . . "Fiction films"@en . . . . "A disc jockey tries to prove to teenagers' parents that rock 'n' roll is harmless and won't turn their kids into juvenile deliquents."@en . . . . "Heritage International Films (Firm)" . . "To 1961" . . . .