More than I can list or remember but..
Zeppelin, Pink Floyd, Johnny Cash, Bob Dylan, Black Sabbath, Moby, Rolling Stones, Rob Zombie, Goldfrapp, Radiohead and on occasion some Ludovico Einaudi.
And this is my favourite workout tune - http://www.youtube.com/watch?v=_Waqn0jBG58
EDIT: Audioslve...