Yes, I always listen to music while working. I listen to many different genres of music...depending on what I'm doing will depend on which one I choose. When I worked as a Project Admin for a huge company and someone had a high priority job for me to do I would pull out my iPod and crank up The Creation (Excerpts): Terzett mit Chor: "Der Herr ist gross in seiner Macht".
Whenever I do a portrait I can't concentrate unless there is music playing.
If it's work that I really need to concentrate on such as writing an essay then I will work in silence generally. If it's mundane tasks such as proof reading or tidying it up, then I will need music to entertain myself.
But again. I don't listen to Music while I work. I tried it once, it was okay but I still prefer the Silence and Sound of my PC's Fan and Keyboard. To me, listening to Music while working is a bit distracting.