John Cage's 4'33 (someone had to say it)
It very much depends on my mood, but usually lyrics get in the way so I go for instrumental.
When I'm in the mood for classical, I gravitate towards Bach.
When I'm in a more modern mood, I go for electronic/ambient. I used to know the names of the pieces and artists (Jean Michel Jarre comes to mind) but these days, I let Google Play or Deezer pick for me.
I also use focus@will, a music service that's supposed to help you concentrate. I find it generally helps, but then again, I used when I really want to concentrate, so it's self-fulfilling. I go for the "alpha chill" channel more often than not.
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