What sorts of music do you like to play during your games? I prefer Progressive Rock like Rush, Yes and similar. To me, D&D and Prog Rock have always gone hand in hand. Not that I am against other sorts of music during games, this just really gets my creative juices flowing.
One band I have recently encountered is Wolf People (http://www.youtube.com/watch?v=qfDbWuUw5uY&feature=related) a folksy prog rock band from the British Isles, and a new favorite.