Spotify

works for me, just got it running at work.
means I can have a bit of something different to drown out the office politics... "who's changed the height of my chair"

Bit of advice, if you have a quite strict IT it might be an idea to keep it on the down low, once a few people get into it, it can drink up your bandwidth
The internet restrictions at my work are pretty tight, i'm actually amazed they haven't banned it already, mind you this is probably because they haven't figured out how.