As silly as it sounds, dubstep and other fast-paced, energetic music. I find my pace of coding often matches my internal energy so that I start to slow down and get less done when listening to relaxing, meditative music.
The sort of Dubstep you often hear on Dubstep.fm I think is the ideal sort. It's usually not constantly blaring funny noises at you the way it is when you see it live (bro-step, you might say.) It is usually somewhat upbeat but laid back and groovy at the same time.
Even though I listen to slower/ambient music I can totally understand this. I used to crank up Way Out West and drink lots of caffeine...I would get an amazing amount of work done (at least relative to myself)
