The goal: nothing less than the deconstruction and obliteration of rock and roll. The method: noise, a genre awash in dissonance and off-key chaos. Chief practitioners: nationally known local bands such as Harry Pussy and To Live and Shave in L.A. Results: nah. In fact the noise genre, which Miami nurtured and which seemed to be making an impact nationally, has been nearly silenced. In the case of the headache-inducing sound, it's a matter of first ones in, last ones out. Rat Bastard, a noise pioneer, and the Laundry Room Squelchers, an informal amalgam of musicians who typically work in other genres, continue to groan and drone every Thursday at Churchill's Hideaway. The disharmonic convergence is derived from traditional instruments, bizarre electronic gadgets, and just about anything else that might help create some of the most unusual sounds this side of a train wreck. When that brutal cacophony merges into a lucid melody, as can happen, it becomes a virtual squelchtopia for Rat's crew and the brave few who endure.