I generally listen to anything that's fast-paced, or that's just plain awesome. For example...
"Smells Like Teen Spirit" - Nirvanna.
"What's Up?!" - Maximum the Hormone.
"Break The Walls" - Jim Johnston.
"Headstrong" - Whoever sings that.
"Out Of My Head" - Puddle of Mudd.
"Shut Me Up" - Mindless Self Indulgence.
"Veni Vidi Vici" - Barlait.
And, if I'm trying to max out with bench press or squat, I listen to "Requiem For a Dream". Just for the sheer epicness.