Unless I am doing Arenas or for some other event that involves voice chat, I usually turn my WoW sounds off. I either watch episodes of my favorite science fiction shows or listen to music.
I have compiled the following WoW-inspired, classic-rock soundtrack for grinding.
Ozzy Osbourne - The Wizard, for the Mages of the world.
Aerosmith - Dude Looks Like a Lady, with all due respect to elves of both factions.
Ted Nugent - Cat Scratch Fever, I guess I could have gone with Fred Bear- either work for Druids.
Queen - Fat Bottom Girls, because Tauren females make the rockin' world go 'round.
Blue Oyster Cult - Don't Fear the Reaper, in honor of Undeads.
Black Sabbath - Iron Man, perfect for Warriors and Paladins, but more for Warriors.
The Eagles - Witchy Woman, which seems to fit Warlocks.
Styx - Mr. Roboto, for everyone who's ever been stomped by the Fel Reavers in Hellfire Peninsula.
Led Zeppelin - Ramble On, OK it's about a different fantasy epic, but it's a great song.
What do you listen to while you play?
EDIT: Corrected the spelling of Ozzy, but I'm leaving it as an Ozzy song rather than Black Sabbath as the version I have is solo off the "Hot and Heavy" compilation disc. Thanks though!