Gastr Del Sol is an American post-rock band with a penchant for experimental and avant-garde music, formed in Chicago in 1991. The core of the group centered around the partnership of David Grubbs and Jim O'Rourke, both of whom possess strong pedigrees in the underground music scene, with Grubbs having roots in the band Bastro and O'Rourke being a prolific musician and producer involved in various projects. Gastr Del Sol is known for their challenging musical structures, blending elements of rock, folk, jazz, and contemporary classical music, creating soundscapes that defy easy categorization.

Throughout the 1990s, Gastr Del Sol released a string of critically acclaimed albums that contributed significantly to the post-rock genre, pushing the boundaries of music with their innovative compositions. "Crookt, Crackt, or Fly" (1994) and "Upgrade & Afterlife" (1996) displayed the band's evolving sound that was as much about texture and mood as it was about melody and form. With the release of "Mirror Repair" (1997), they continued experimenting with instrumentation and production techniques. Their final album, "Camoufleur" (1998), is often considered their most accessible and cohesive work, showcasing the band's ability to weave intricate, delicate melodies with complex arrangements. The album's lush soundscapes and nuanced musicianship marked a high point in the band's career and left a lasting impact on the experimental music scene before their eventual dissolution in 1998.