Exploring recent trends toward glacial, long-form improvisations, Teeth So Sharp marries heavy guitar rock and art sound sensibilities. Comprising members of Buffalo’s Novelist and Brookyln’s Asten, Teeth So Sharp is an all guitar trio that harnesses feedback and drone to create sustained beds of ambient noise. Joining them on stage at Soundlab this Saturday (Sept. 1) is Cages (Nola Ann, providing hymnal vocal gymnastics and field recordings, and David Bailey on guitar and electronics), with special guest Steve Backzkowski. Although initially fashioning what felt like fractured nursery rhymes exploding with haunted, over the top vocals, Cages is maturing into a magnificently abstract ambient unit in full command of its own sound. The addition of Baczkowski, whose furious baritone sax playing and found sound manipulation promises to broaden the group even further, renders this unsual collaboration an intriguing experiment in atmospheric chaos. Show starts at 9pm.