Vaudeville, Americana, and rock ‘n’ roll are the jumping-off points for this tight Bay Area trio smitten with the subtle humor of They Might Be Giants. There’s a little bit of weird-for-the-sake-of-weird, though it rarely gets in the way, and over the course of 72 packed minutes, Comfy Chair asserts its allegiance not to geeky gimmickry but to music itself.