I listen to a lot of Jazz, blues, classic rock, and everything else.
Right now, my 6 CD changer has Zappa, Miles Davis, Jethro Tull (Sorry Steve), King Crimson, Primus, and Ramsey Lewis. (I TOLD you I listen to everything.)
I find that the music can change from job to job. Jazz, and really progressive stuff for fine detail work. Country for sanding, grinding, etc... Hard rock for assembly, and when you need to hear the music over the Dremel tool, or air compressor. Sometimes Classical or Opera for fine detail work, and trimming decals.
And Black Sabbath's "War Pigs" for the final stages of decal and detail work when you are ready to hold the almost completed model over your desk while making "Boom Boom" noises... (Admit it, everybody does this at least once)