Walnut Street Theatre offers special treats for musical theater fans in their intimate Independence Studio on 3. While Fiddler on the Roof plays on the main stage, Eric Rockwell and Joanne Bogart's The Musical of Musicals (The Musical!) romps on the third floor, a good-natured spoof of musical styles in five scenes. Victims include Rodgers and Hammerstein (Oklahoma!), Stephen Sondheim (Sweeney Todd), Jerry Herman (Gypsy), Andrew Lloyd Webber (Jesus Christ Superstar) and Kander and Ebb (Chicago). Last year's studio season-ender, the classic parody Forbidden Broadway, scored accolades, sold-out houses and a Barrymore Award, so why not lampoon musical theater again?