Poll: Classic Performance Musicals

From IMDb: "Performance musicals happen within the guidelines of the real world; the musical numbers that happen can all be explained by the rules of the real world, usually within the framework of some sort of performance that happens by the characters. This is as opposed to organic musicals. Organic musicals are musicals where people literally burst into song with background music in the middle of the scene, and there's no real world explanation to it." Based on this explanation, which of these classic performance musicals is your favorite? After voting, you might discuss the list here