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The core group consisted of Peter Albin of Big Brother and the Holding Company, John Cipollina of Quicksilver Messenger Service, Spencer Dryden of Jefferson Airplane, Robert Hunter of the Grateful Dead, Barry Melton of Country Joe and the Fish and keyboardist Merl Saunders from the Saunders-Garcia Band. Over time Papa John Creach of Hot Tuna, Jack Casady of Jefferson Airplane, Nicky Hopkins, Dave Getz, Country Joe McDonald and other prominent San Francisco musicians guest starred with the group In the 1990s, David LaFlamme of It's a Beautiful Day and Jerry Miller of Moby Grape also toured with this group.