Satan and heavy metal
Many people consider Black Sabbath the first real heavy metal band and coincidently Sabbath were often accused of being devil worshippers. So that would mean that people thinking that metal and the devil went hand in hand has been around as long as metal itself. The 80's were the real height (at least here in the states) of metal getting accused of being evil or promoting the devil. The PMRC had their trials in 1985 and I remember news shows and magazines having stories about this topic fairly often between say 84 and 87. Some bands like Venom, Mercyful Fate and Slayer really talked about topics relating to the devil. Yet more often than not, it was a matter of metal bands getting bad rap from people that knew nothing about music. I had tough time as a teenager because my mother hated the music I listened to and she was probably worried it would corrupt me. I think I turned out okay. At least I got past that heavy metal stage of my life, oh wait maybe it wasn't just a stage. Anyway now there are plenty of underground metal bands that love to talk about the devil. I guess it's not as shocking as it was 20 years ago though.