My Personal Big Four: The Residents, DEVO, Gary Numan, and GWAR.
Otherwise I'm listening to Celtic Folk [especially Ossian, Planxty, Tanahill Weavers, Bothy Band], Scandinavian Folk, Wyrd & Electric Folk, vintage synthesizer, assorted Metal [especially Samael, Cradle of Filth, GWAR of course], and all kinds of other random artists depending on the mood and/or season.