In my one and only half marathon I was really flagging when a bootleg mix of Eye of the Tiger and some rap song came one.....and it really made me pick my legs up...couldn't have timed it better if I'd tried! I always have my pod on shuffle for running just to keep me guessing and have a real mixture on it including:
Chemical Brothers, Masters at work, the Smiths, the Cure, too many dj's, depeche mode, duran duran, groove armada, old skool reggae stuff - no idea who its by, Johnny Cash, Mint Royale, Flying Pops, Blondie, Zero 7, Chungking, Lemon Jelly...a right old weird mixture basically!!
I am well up for trying Metallica! Might try some GnR's too!