Tortoise is an American post-rock band formed in Chicago, Illinois in 1990.  Tortoise have been consistently credited for the rise of the post-rock movement in the 1990s.

Tortoise revolutionized American indie rock in the mid-'90s by playing down tried-and-true punk and rock & roll influences, emphasizing instead the incorporation of a variety of left-field music genres from the past 20 years, including Krautrock, dub, classical minimalism, ambient and space music, prog-rock, film music, and British electronica.

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