Quad City Music Guild's Cabaret is at its most entertaining whenever Bryan Tank's Emcee graces the stage - "graces" being a somewhat incorrect term, as it's the actor's unflinching commitment to his character's blatantly sexual nature that's so engaging. With his impressive German accent and convincing characterization of unabashed debauchery, Tank punctuates the beguilement of his Emcee by way of sexual gestures that seemed to titillate Thursday's preview-performance audience, at least judging by the large amounts of laughter mixed with amused shock. (This was most notable during the threesome pelvic thrusts and other dance steps in Cabaret's "Two Ladies" number, one of several deliciously bawdy pieces choreographed by Emma Williams.)