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Right now I've been playing Red Hot Chili Peppers ("Mother's Milk") and Orange Range ("Musiq") every workout. Orange Range is a little like a Japanese Chili Peppers -- http://en.wikipedia.org/wiki/Orange_Range , but with more techno (yes..) and pop.
The humor and tempo of both keep me going, with just enough soul and emotion but not enough to be distracting when I'm a dripping, drooling mess on the leg machine.