I listen to music a lot. I have a job that basically entails staring at a vast array of spread sheets and statistics then making decisions about what group of my staff will implement and ultimately take the blame if the decisions turn out to be wrong (for that is the joys of higher end management!). Staring at spread sheets uses little more than my eyes and the occasional flexing of a mouse finger, meaning that my ears are free to listen to about 8-10 hours of music a day within the confines of my office.