A little bit of everything...but when I really need to be productive I always put on the 'Tragic Boogie' album by The Life and Times.
https://www.youtube.com/watch?v=Z7mReSQ-CZs&list=PLFNYv0PFOF...
It's been my go-to for 7 or 8 years now. Something about it just triggers the best of my skills to come out.