James Cagney channels Busby Berkeley (who choreographs the stunning, kaleidoscopic dance routines) as a Broadway director who comes up with a scheme to break into movies through, well, stunning, kaleidoscopic dance routines. (Cagney even does some hoofing of his own.) Joan Blondell, Ruby Keeler and Dick Powell co-star in this musical extravaganza that includes such vintage songs as "Honeymoon Hotel," "Shanghai Lil" and "By a Waterfall."