Drawn from: http://i.imgur.com/gFWks.jpg

Band called "Ghost", and their whole schtick is that they're satan worshipers. For live shows, the frontman dresses up as an evil pope, and the rest of the bandmates are nameless, faceless people who wear hooded robes and masks that cover their face. I actually saw them live, and they pretty much stole the show from the headlining bands.

Their sound is best described as Blue Oyster Cult meets King Diamond, and this is my favorite track from them: http://www.youtube.com/watch?v=0PakoE1eBps

Also, CLAP FOR SATAN!