Right now, nothing in particular. But when I still ran a D&D campaign, I often listened to game scores while drawing dungeons or encounter maps. Games like Planescape: Torment, Baldur's Gate (II) and, strangely, Monkey Island really worked for me. Other than that, some decent progmetal and simply weird music, like Tool, Opeth , Therion, Godspeed You! Black Emperor.