There are actually a few Christian metal bands that I like. But I don't listen to them because they're Christian, I listen to them because they legit have good music, and just happen to have Christian lyrics.
I've debated with some ignorant (using it in the truest sense of the word, not insulting) people about the Stones. They bring up the fact that they have a song called "Sympathy for the Devil" without having ever heard it. I'm not saying that Mick Jagger is an altar boy, but that song is anything but satanic. You could preach a whole sermon on it.