San Francisco folkster Jenny Gillespie Mason teamed up some time ago with Rob Shelton, a longtime engineer at John Vanderslice's magical Tiny Telephone studio to create the experimental pop phenom Sis, appearing tonight at the Outer Space for a steal of a show at 7 p.m. A mere $6 will get you through the door and also treat you to an auxiliary showing of two of Humboldt's finest feeling-makers: Mister Moonbeam and Comma Comma.