Composer, guitarist, multi-instrumentalist Fred Frith is revisiting his trailblazing "dance music" album, Gravity, in concert this Saturday night at Slim's in San Francisco. Tonight he talks with Derk Richardson about the recording of that album in 1979 and how he re-imagines it for a new band of musicians (organized by him, Dominique Leone, and Aaron Novik). We'll play music from the remastered CD version.