Rachael Beck has appeared in the Australian version of the musical that has a book by whom?
Rachael Beck:  She has appeared in the Australian musical theatre productions of "Cats" (1985), Disney's "Beauty and the Beast" (1995–96), "Les Misérables" (1995–96), "The Sound of Music" (August 2000 to February 2001), "Cabaret", "Singing in the Rain" and "Chitty Chitty Bang Bang". Singin' in the Rain (musical): Singin' in the Rain is a musical with a book by Betty Comden and Adolph Green, lyrics by Arthur Freed, and music by Nacio Herb Brown.
Betty Comden and Adolph Green