Chaplin, the new musical depicting the life of screen legend Charlie Chaplin, begins previews at Broadway's Barrymore Theatre on Aug. 21. At a recent rehearsal, the cast, including Rob McClure (Charlie Chaplin), Jenn Colella (Hedda Hopper) and Erin Mackey (Oona O'Neill), gave a sneak peek at some of the songs from the show, which has a score by Christopher Curtis and book by Curtis and Thomas Meehan.