His music is rife with introspection, regret, wistfulness, and longing, and Accumulation: None piles on these emotions in spades. The primitive recording style -- mainly solo Callahan on guitar and deep, twangy vocals, perhaps with a cheap-sounding drum machine keeping time -- reinforces the music-as-therapy sensation. Picture Beck sucking on a gas pipe rather than a bong.
But it's not all doom and gloom: For instance, Callahan's spontaneous dropping of Sir Mix-a-Lot's "Baby Got Back" into the coda of the restlessly aching ballad "Real Live Dress" is laugh-out-loud funny. It's precisely this black humor that makes Callahan a maverick musical genius, rather than a pimply Creative Writing major with a four-track.