American musicians Dee Snider and Frank Zappa hold up parental advisory stickers during the PMRC senate hearing at Capitol Hill, Washington DC, United States, 19th September 1985. Representatives of the Parents Music Resource Center, senators and musicians testified before the Senate Commerce, Science and Transportation Committee on ‘the subject of the content of certain sound recordings and suggestions that recording packages be labeled to provide a warning to prospective purchasers of sexually explicit or other potentially offensive content’. (Photo by Mark Weiss/Getty Images)