During class, we usually have one of the modern stations on the radio....very low, so it is not quite noticeable. However, we do turn music up for sparring, as it helps to get some of us to relax a bit more.....and get more "in the groove"......
If I am using music for my own purposes, like just working out or psyching myself up for class/sparring, etc, I tend to like more the techno bent. If I am working on flow or meditation, or just want to zone out a bit more, I will put on shakuhachi flute or something similar.
Music does have a pretty good way of influencing moods, I can say that for sure.....
Peace--