Those crafty guys with lab coats and beakers have crafted the ULTIMATE WORKOUT PLAYLIST. They based it on BPM (Beats Per Minute), and how they equated with what you're doing.
Ideally, you're should listen to pop music like KATY PERRY when you're stretching, doing cardio, or cooling off . . . rap like PITBULL for running . . . EDM for lifting weights . . . and ZERO rock and roll, I guess because it throws off your rhythm.