Before every 7 p.m. and 10 p.m. weekend screenings at Oakland’s Grand Lake Theater, Gordon Pratt pays tribute to the vaudeville–an act made obsolete by technological advancements in sound. While the ushers are still cleaning up spilled popcorn and the audience is beginning to file in, Pratt plays a few tunes on the pipe organ–a complex musical instrument, which has seen its best days fly by.