Berkeley William Enos, known professionally as Busby Berkeley, was an American film director and musical choreographer. Berkeley devised elaborate musical production numbers that often involved complex geometric patterns. Berkeley's works used large numbers of showgirls and props as fantasy elements in kaleidoscopic on-screen performances.

Musical film is a film genre in which songs by the characters are interwoven into the narrative, sometimes accompanied by dancing. The songs usually advance the plot or develop the film's characters, but in some cases, they serve merely as breaks in the storyline, often as elaborate "production numbers".