Pretty much any good film soundtrack. My most productive one is LOTR: Fellowship of the Ring.

Here are some good playlists that I fire up when I want to get into a flow. I've also been listening to a lot of Blood Orange, Mitch Murder, and Perera Elsewhere lately. Another thing that might get overlooked but I think is great for focusing/problem solving is the Halo 3: ODST Soundtrack(http://rd.io/x/QcOV0CJQeEo/)

http://rd.io/x/QcOV0DMPk3w/

http://rd.io/x/QcOV0DNEodM/

http://rd.io/x/QcOV0DNLmJQ/

I just use regular old iTunes so music Royksopp, Ellie Goulding, Jack Johson, Bon Iver and others along those lines helps me focus.

I should really use Rdio or Spotify

Grimes or Chromatics are go-to's, but something in the same vibe that's no-vocals is probably preferable. Non-distracting, chill creative vibe.

I usually start out with a heavy dose of Oddisee on Rdio, but then I usually will let autoplay take the wheel once this album finishes: http://rd.io/x/QYUviiJkFyE/