Colossamite

From Wikipedia:

Colossamite was an American math rock band based in Minneapolis, Minnesota. They were one of the most prominent exponents of the genre. Like similar groups such as Zeni Geva, Craw, U.S. Maple, or Dazzling Killmen (this last group for which Sakes sang before relocating to Minnesota) Colossamite's music was almost hyperbolically brutal, chaotic, and rhythmically and formally complex. Rather than relying, as most heavy metal bands, on guitar distortion to produce an intense sound, Colossamite instead often relied on very loud "clean" (undistorted) guitars, played dissonantly, in conjunction with vocals that were screamed rather than sung. Songs featured jarring shifts in tempo and mood, with the overall sound being extremely raw, heavy and often slow.

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Colossamite 1998-01-20 A-1, Knoxville, TN, USA