Apocalyptica. Finnish band who's unique twist is four cellists playing the music. What is it with bands from Finland and teh awesome? I'm not sure, but check out these songs.
If you want to be moved (grab that kleenex):
http://www.youtube.com/watch?v=JbE_t3TvbhQ (version with no vocals)
http://www.youtube.com/watch?v=LQBp-snyfzs (version with vocals)
and
http://www.youtube.com/watch?v=NOMvkGeQOFE or if you want pure bad-assery (turn that shit up):
http://www.youtube.com/watch?v=OGnAzkh9kn0and
http://www.youtube.com/watch?v=eM4qMuhEgeA