101. Deadguy - Fixation on a Coworker (1995)
Considered one of the most important early metalcore bands, and a founder of mathcore, Deadguy get the shaft, largely because they're associated with a metal genre most ignorant metal fans consider to be bereft of any redeeming values (also because they only released one full-length). One listen to this brutal collection of angular, dissonant, challenging riffs and venomous, misanthropix, hardcore punk vocals would be like a slap in the face to their smug, purist faces.
This album rather defies comparison to anything that came before (that I'm aware of at least). It's certainly metal, but Deadguy clearly come from a hardcore background, which leaves them refreshingly and uncaringly out of step with what a "metal album" is "supposed" to sound like, even one with a heavy punk influence. Yet it spits on hardcore conventions as well: they have plenty of slower breakdown sections, but the oddball time signatures turn what is usually "The Mosh Part" into a nihilistic exercise in barely contained mania that is integral rather than tacked on.