At work, I have my earphones in constantly, even when I've no music playing. For one thing, people tend to assume that you can't hear them, and you can pick up on a lot of useful information
I never play music out loud, always through earphones - to me, enforcing your own taste in music on someone else is arrogant, unless someone specifically asks to hear it of course - I hate when people play their own crap in cars, my brother does that all the time no matter how often I tell him off

Like, a trip to the local shop isn't cause for 5-finger-death-punch at full volume!
When I do have music on, tends to be old 90's grunge like Pearl Jam, old electro music like Vangelis or Jarre or Tangerine Dream, or a soundtrack - esp Bastion and Tron Legacy - Tron OST by DaftPunk is awesome for coding to, somehow it makes whatever your coding seem epic. I prefer music with no lyrics when coding, and music with lyrics when doing artwork.

I am the one who knocks...
