Incredibox - Background music for programming. 
I can hack/design for hours without even knowing it while listening to Kap Slap.<p>It also helps you run a 5K faster than you might have originally imagined :)<p>Anyone who likes remixes/house/dubstep I'd encourage you check it out! The spring break mix is an hour long and it's full of goodies.<p><a href="http://soundcloud.com/kapslap/kap-slap-spring-break-mix" rel="nofollow">http://soundcloud.com/kapslap/kap-slap-spring-break-mix</a><p>p.s. I'm only evangelizing this stuff so much because honestly if I set out to run 10k I'll listen to this and it will help me get there more than anything else. Or if I wanna kill a new comp or a handful of bugs, [PLAY] and it sucks me in like a vortex.