Gastr del Sol (derived from a derby-winning horse called "Gato del Sol") is an oft-cited stalwart of the post-rock movement of the 1990s. Based in Chicago, Gastr del Sol explored idiosyncratic sonic textures, veering from avant-garde punk to atonal songcraft to Musique concrète to composition for small orchestra. The group began as the brain-child of David Grubbs, an alumnus of the Louisville, KY punk rock scene that produced Squirrel Bait and Slint, the former of which he was a member.