I listen to Rinse.fm (<a href="http://rinse.fm" rel="nofollow">http://rinse.fm</a>) incessantly for 8+ hours a day, it's got some of the best DJs in London for dubstep, house, grime, reggae, and everything in between. Always a solid listen.<p>Otherwise, usually anything instrumental. B.Lewis, Apollo Brown, and Pretty Lights have some great instrumental albums out now which cast a positive and productive vibe on my hack sessions.<p>Oh, and people apparently enjoy coding to my instrumental album! :) <a href="http://djmarmalade.com" rel="nofollow">http://djmarmalade.com</a> (free download, shameless plug).