Tortoise is an American post-rock band formed in Chicago, Illinois in 1990. The band incorporates krautrock, dub, minimal music, electronica and jazz into their music, and their eclectic style has left a great influence on the post-rock genre. Tortoise have been consistently credited for the rise of the post-rock movement in the 1990s.

Post-rock is a form of experimental rock characterized by a focus on exploring textures and timbres, as well as non-rock styles, with less emphasis on conventional song structures or riffs. Post-rock artists typically combine rock instrumentation with electronics. The genre emerged within the indie and underground music scene of the 1980s and early 1990s. However, due to its abandonment of rock conventions, it began to increasingly show little resemblance musically to conventional indie rock at the time, borrowing instead from diverse sources including ambient, electronica, jazz, krautrock, dub, and minimalist classical, with these influences also being pivotal for the style of ambient pop.