If you play Havoc Brigade and you have access to Spotify, then you might like to take a look at this playlist I've put together for the game.
I had a good think about what sort of music would suit the mad-cap, brutal antics of orcs on a rampage, and I settled on Gypsy Punk. There's something foreign and unfettered about it, which I think suits the theme.
Then, I cut that with a load of early Hives, some Alestorm, and The Reverend Horton Heat along with a handful of weird, experimental, distorted guitar tracks. I think it works! Take a listen.