Just about the best Hollywood musical of all time, wrote Pauline Kael about 'Singin' in the Rain'. After years of honing his skills on the vaudeville stage, hoofer Don Lockwood (Gene Kelly) has finally reached the top and become a swashbuckling star of the silent silver screen. Then the self-satisfied celebrity has his confidence shattered when ingenue Kathy Selden (Debbie Reynolds) dismisses film actors as shadows without substance. After getting over the insult, he falls hard for her--much to the consternation of his co-star, the sexy, selfish Lina Lamont (Jean Hagen), who wants Don all to herself. But Don has career troubles too. The wild popularity of 'The Jazz Singer'has studios scrambling to change from silent films to talkies, and Lina's shrill voice and Don's stiff acting left the preview audience roaring with laughter. There's only one way to save the movie and their careers: turn 'The Duelling Cavalier' into a musical, with Kathy secretly dubbing in Lina's lines and songs. But can they hide the truth from Lina?