In my (Protestant) youth group used to have discussions on whether rock music (classic, heavy metal, hard rock, etc.) was bad for you or could hurt you. Back then, I didn't care since my only musical passion was Beethoven!
The basic premise of this poll is the same stuff that we got from the Moral Majority back in the 1980s (my youth directors must have been members). Music is only bad if you use it for an evil purpose. Singing about the dark side of human nature, which bands like Metallic and Slayer do, isn't evil. Now, if it encouraged people to do such things (and that is highly debatable) then perhaps it should be censored (by apporpriate persons, certainly not by governmental entities; discussion for another time).