If you want some awesome tunes to kick back with or kick some butt with, I highly recommend the album Gods of War by Manowar:
I stumbled upon Manowar in Jack Black's video game Brutal Legend (it has a mostly metal soundtrack); their song The Dawn of Battle was featured and totally melted my face off. A little bit of internets later, I came across this *awesome* concept album that crosses a rock opera with metal and Norse mythology. It's not just metal thrashing all album long; there is definitely a symphonic metal influence, including a choir and symphonic orchestra. The album opens with an overture and has a few very artistic interludes. I'll be honest, though - sometimes the metal just dominates, and I mean DOMINATES (make sure your speakers are turned up to 11):
With the interactions between Loki, Odin, and Thor, as well as armies swearing allegiance and vowing to die in battle with a background of rock, if you are interested in mythology or metal, you really need to check it out!