Gastr del Sol is an American post-rock band formed in 1992, known for their experimental sound that blends elements of rock, jazz, and ambient music. The group was founded by David Grubbs and Jim O'Rourke, both of whom are influential figures in the indie music scene. Their music often features intricate guitar work, unconventional song structures, and a focus on atmosphere. The band released several albums, including "Upgrade & Afterlife" and "The Serpentine Similar," which received critical acclaim for their innovative approach. Gastr del Sol is recognized for its contribution to the Chicago music scene and has influenced many artists in the post-rock genre.