Sword Heaven is one of this town's most enduring (and certainly most high profile) purveyors of experimental noise rock. But they won't endure much longer because Aaron Hibbs (who you may know from his hula hoop exploits) is moving to India soon. That makes Tuesday's show at Skylab, 57 E. Gay St., a crucial event for anybody who's ever loved these hellish screeches. And if you've never partaken of this particular cup, the above clip from 2006 shows just how harrowing Hibbs and Mark Van Fleet can be.

They'll play after Biff Boff Barf and a Massachussetts band called Grey Skull. 9 p.m. start, wrapped up by midnight.