As soon as movies could talk, they began to sing and dance. Over the next nine decades, the movie musical evolved to embrace every type of performance, from operetta to rock to tap to ballet. Musicals drew on Broadway hits and original creations from composers like Cole Porter, George Gershwin, and Irving Berlin. Media historian Brian Rose traces the history of musicals and shows more than 30 excerpts spotlighting artists including Fred Astaire, Judy Garland, the Nicholas Brothers, and the Beatles.