I'm a huge fan of metal: progressive metal, power metal... a cappella metal?
[video=youtube;fsVlfuWCRpw]http://www.youtube.com/watch?v=fsVlfuWCRpw[/video]
Edit/Note: Sometimes I think songs are misunderstood. Some people would consider this song demonic, but it's not at all. I mean, really? It's just from a darker perspective.