The San Francisco-based Matthew Schoening creates improvisational music that features electric cello played over live loops of bass, percussion and ambient sounds achieved through bowing, strumming and percussive techniques. His process builds until it sounds like a full band. The show starts at 8 p.m. Thursday, Aug. 15, at the Unitarian Fellowship, 87 Fourth St. Advance tickets cost $15 at, or $20 at the door.