[Charles H. (The_r0nin)]

I would say "O Fortuna" from Carmina Burana. Music to invade Europe by (Carl Orff was the official composer to the Third Reich, you know).

I'm surprised no one has said "Hair of the Dog" by Nazareth:

"Now you're messin' with... a son of a b****!"

[NinjaDetective]

"Duel of the Fates" by John Williams
"Anvil of Crom" and "The Riders of Doom" from Conan the Barbarian