Back in 1951 MGM released Royal Wedding, one of the movie musicals for which the studio was noted. Famous for the scene that has Fred Astaire dancing on the walls and ceiling (done by having a rotating set and a fixed camera . . . with the cameraman strapped into his seat), the film — which is now in the public domain — was a riff on the marriage of then-Princess Elizabeth and Phillip Mountbatten in 1947.