Tortoise

Tortoise is the foundational pillar of the 'Chicago school' of post-rock, formed in 1990 by a collective of musicians from the city's fertile punk and indie scenes. Their sound identity is defined by a rejection of rock traditionalism in favor of a polyglot approach that incorporates dub, jazz, krautrock, and minimalism.

Key to their sonic signature is the use of unconventional instrumentation, specifically multiple bassists and a heavy reliance on vibraphones and marimbas, which provides a melodic percussive quality distinct from their contemporaries. The band's evolution saw them move from the dub-heavy experiments of their self-titled debut to the landmark 'Millions Now Living Will Never Die' and the more jazz-inflected 'TNT,' which utilized early digital editing to stitch together live performances into seamless, impossible compositions. Critically, they are viewed as the bridge between the aggressive noise of the 80s underground and the sophisticated, instrumental art-rock of the 21st century. Their influence is vast, touching everything from modern jazz fusion to electronic downtempo and the broader math-rock movement.