When you spend a large amount of time on the computer during the day, Internet radio can be a sanity saviour. I spend a lot of my time listening to 3WK or 3WK Classic on I-Tunes. The music keeps me going and I enjoy hearing a lot of artists that I don't typically hear on my local radio stations.
I also was listening to Pandora, but they started putting limits on the amount of time you can listen per month. I understand why they did this, but it's still slightly annoying. If you haven't tried Pandora though, you should check it out. The site allows you to create your own radio stations based on your favorite artists and songs. It's a pretty good concept. You can also mix artists on stations, so you could have a Prince and Annie Lennox station.
Anyway, I have also been wasting time on the Internet watching music videos on Youtube. Though I haven't done this too often, it is easy to lose track of time when watching your favorite artists. That said, do enjoy one of my favorite musicians in this Youtube clip. After all, we all need a little escapism now and then, right? What do you listen to when you work?