I used to listen to a huge amount of music when I'm at work - as a programmer, it's not impossible to get into work, go to your desk, put your head down to work for a 10 hour day and not talk to anyone. Now, that's harder to do when doing actual project management, but I find that I can still put in a good 2 hours each day with my hands on my keys and my iPod in my ears. Makes for some extremely high job satisfaction, in my opinion.
My problem with consuming music at work, though, is the following: I have a lot of music, but why would I ever listen to anything except for the last part of Underworld 1999-2002 (Cd 1) bleeding into the first part of Underworld 1999-2002 (Cd 2). Seriously. Here is the track list:
1) Mmm Skyscraper I Love You
2) Rez
3) Dirty Epic
4) Dark and Long [Dark Train]
5) Cowgirl
6) Born Slippy.NUXX
7) Pearl's Girl
That's something like 3 of the best 100 songs of all time (3, 5, 7), and three of the others are in the top 1000. I would have skipped Skyscraper, but honestly I'm afraid that if I jump right into Rez, my heart will explode like the engine of a car revved too high soon after starting.