Tortoise's almost entirely instrumental music defies easy categorization, and the group gained significant attention from their early career. The members have roots in Chicago's fertile music scene, playing in various indie rock and punk groups. Tortoise was among the first American indie rock bands to incorporate styles closer to Krautrock, dub, minimalist music, electronica and various jazz styles, rather than the standard rock and roll and punk that had dominated indie rock for years.

Some have cited Tortoise as being one of the prime forces behind the development and popularity of the post-rock movement.[2][3] Others have compared their music to the progressive rock of Yes

Where their debut had been a mixed and largely unstructured collection of leftfield soundscapes, followed by Millions Now Living's surprising love-letter to Krautrock, the third Tortoise release, the all instrumental TNT, was almost a lounge album - but lounge for thinkers. You certainly couldn't call this a rock album, any more than you could call it techno, acoustic, ambient or jazz, but Tortoise take all of those styles and more, building fabulously fat beds of bottom end, overlaid with gorgeous multi-layered guitars, vibes and sampled found sounds, and emerge with one of the last decade's most endlessly satisfying releases.

With it's frantic, sampled drum pattern, `Jetty' could almost be trip-hop, (in fact trip-hop is the lasting after-image of the album), `Swung From The Gutters' has a vague jazz structure to it, at the same time throwing in backward tape effects, `I Set My Face To The Hillside' combines - almost unbelievably - both Spaghetti Western and oriental themes¼ and so it goes, constantly bewildering, constantly enchanting. And then there's the divine beauty of the title track... (sigh)

And it gets better with every listen. (Amazon review)