Lemme see...
Alestorm (Scottish Pirate Metal)
Blue Plate Special (Wisconsin-based Blues band that's been touring since the sixties)
Bolt Thrower (obscure-ish metal band inspired by Warhammer 40,000)
Lamb of God (just kidding)
Peter Fox (German Hip-Hop artist)
Sacred Reich (90's heavy metal band)
Spiderbait (the hard rockin' Aussies behind the greatest cover of "Black Betty" EVER)
http://www.youtube.com/watch?v=nU1VfYYKMDk
Symphorce (Melodic Metal band)
Yannis Kamarinos (Techno artist behind the song "Money Shot", as made famous by its presence in the AT&T "Techno Twins" commercial)
Then of course there's Horatio Lee Jenkins, the group behind such classics as, "Drunker than Satan", "It's Okay to be Gay", and "Girl, This Bed is too Big Without All 12 of You".
http://www.youtube.com/watch?v=nU1VfYYKMDk
The last one is possibly the most underrated group of this century and the last.