An outsider among the outsiders, Gebbia has been embraced by the Bay Area's inclusive creative-music community, which makes perfect sense: San Francisco has long been regarded by the rest of the country as a quirky, insular town whose music scene can't compare to that of, say, New York or Chicago. But those who follow global new-music developments know this is a gross misconception. Despite marginal audience and media support, inventive music thrives in the Bay Area. And some of the scene's top-tier players will be turning out to welcome home their Mediterranean cousin at his first appearance on the West Coast in more than a year. Arch improvisers on the bill include Tom Nunn (of alien-sounding homemade instruments fame), Tim Perkis (electronics guru), Gino Robair (extreme percussionist), Fred Frith (six-string deconstructionist), and Gebbia's People in Motion bandmates Damon Smith (bass) and Garth Powell (drums). It's telling that the saxophonist's collaborators for this performance hail from the sound-craftier side of the stream. Given the Sicilian's dual emphasis on melodic fundamentals and post-melody extrapolation, combined with the Californians' lust for lyricism from the least likely sources, this could be the most dynamic improv summit of the season.