DREAM THEATER's John Petrucci will be conducting a guitar clinic at the Sound Control store (Oxford Street) in London, England on October 23. Petrucci will be demonstrating his incredible prowess on the electric guitar as well as spending time chatting to fans, fielding questions and holding a short signing session.As previously reported, DREAM THEATER performed PINK FLOYD's "Dark Side of the Moon" in its entirety as their second set on October 11 at the Heineken Music Hall in Amsterdam. This continues DREAM THEATER's tradition of covering a "classic album" in entirety whenever doing a two-night stand in the same city (the band previous covered METALLICA's "Master of Puppets" and IRON MAIDEN's "The Number of the Beast" in 2002). Joining the group for the performance was Mike Kidson on saxophone (from "the Australian Pink Floyd Show") and Theresa Thomason (who previously appeared with DREAM THEATER on "Scenes from a Memory" and "Live Scenes from New York"). DREAM THEATER are scheduled to perform the album one more time on October 25 for the second night of their two-night stand at the famous Hammersmith Apollo in London.