I'm offering two free mp3s today:
-"Night of the Living Dead" by G. Love & Special Sauce, taken from their album Electric Mile.
-"The Gonk (Kid Koala Mix)" by The Noveltones. This song is one of the goofy pieces of "mall music" from the original Dawn of the Dead, given the turntablist treatment by Kid Koala and appears in the end credits of Shaun of the Dead (taken from that movie's excellent soundtrack).
I'd make it the trifecta and offer "Zombie" by the Cranberries (or perhaps something by The Zombies), but I don't own that song. Such is life.
Anyway, if you want a copy of either or both songs, leave me a comment and I'll e-mail it/them to you.