(MUSIC) A freewheeling Portland collective, Jackie-O Motherfucker are linchpins in the chimerical "New Weird America" scene (pace UK mag the Wire). Pundits also call them catalysts of the burgeoning freak-folk movement. All of that critical jargon dissipates once you experience JOMF's whole-grained amalgam of slow-fused improv sorcery and blissed-out balladry. Supporting the best album of their long career, Flags of the Sacred Harp, JOMF excavate and update the holy drone of trad-folk songcraft and beautify free-rock maneuvers. (Chop Suey, 1325 E Madison St, 324-8000. 8 pm, $7, 21+.)