Singin' in the Rain “pours” down delight, capturing the waning days of the silent screen era as they give way to new-fangled “talkies.” With the premiere of The Jazz Singer making Hollywood frantic, movie studios are forced to suddenly change all the movie-making rules at once, to accommodate sound. In doing so, they leave silent pictures -- and some of their stars -- behind. When Monumental Studios turns the silent film The Dueling Cavalier into The Dancing Cavalier, a musical picture, in order to stay relevant, they are faced with a problem: their star, Lina Lamont can’t sing, and can’t even really talk. Lina’s voice sounds something like nails on a chalkboard. Enter Kathy Selden, an aspiring actress whose dulcet tones are able to cover Lina Lamont’s -- calling into question what it means to act, how credit is distributed, and what it means to get a fair shake in the movie business.