I wish more people had heard of
Jim Thirlwell (Foetus, Steriod Maximus, Maonrexia, et. al).
As a composer and arranger, the versatility and depth of his skill is near-unrivaled. Picking over his Foetus albums alone, one can find surf-rock ("Satan Place"), gospel ("Haus on Fah"), big-band swing ("Slung"), filthy blues ("Bedrock"), industrial ("Verklemmt"), cabaret ("Cirrhosis of the Heart"), symphonies ("Overture from Pigdom Come") among countless other genres. He doesn’t just ape genre conventions—he’s skilled enough to remake his own image convincingly in each.
And aside from his musical skills, he's got a gift with lyrics, spinning webs of inverted phrases, deft wordplay, and a pitch-black sense of humor. (Though the latter means that many folks will probably shy away from the tongue-in-cheek revelries of murder, sex, and hate.)
If you watch
The Venture Brothers, you've heard his work—the show's creators were wise enough to enlist Jim's skills as a composer. Pay attention to the music if you're able to.