I won't specifically listen to music if I'm playing a game or watching a video/TV/movie/webcast or something, but other than that, it's pretty much all of the time. Particularly if I'm working on something that I need to focus on oddly enough. I'm a bit ADD and find that music gives me enough of something in the background to keep my mind focused without being too distracting. Plus I am a musician so listening to a lot of music just comes with the territory.