I Listen to a lot of rock and metal (Rush, Iron Maiden,Megadeth, EPICA, Rob Zombie, Blind Guardian etc.) and electronica. The M4U 1 sound amazing; I would consider them bass-lovers headphones. The M4U 1 slam and rumble all right, but only when the track calls for it and it is appropriate, detailed, and full of energy not found in the other headphones mentioned. Never bloated, boomy, or bleeds into the lower mids at all. In fact, the M4U 1 sound fantastic straight out of a iPod. I choose my headphones carefully and only keep those I deem worthy, and I would have no problems recommending anyone get the M4U 1. They really are that good. Watch for my HUGE review on the M4U 1 complete with pictures in the upcoming days.