Today we're discussing Of Natural History by Sleepytime Gorilla Museum. This band is nuts. Like really nuts. You can generally categorize them as prog music, but the result is so much more theatrical, textural, and downright terrifying. Made up of core members and multi-instrumentalists Nils Frykdahl, Carla Kihlstedt, and Dan Rathbun, SGM is nothing short of amazing and completely unique.