The ensemble of Sunset Blvd. When Sunset Boulevard scribes Billy Wilder and Charles Brackett wrote, "All right, Mr. DeMille, I'm ready for my close up," I don't think they meant this close. True, Andrew Lloyd Webber's musical adaptation of the 1950 film is hardly lacking in subtlety. Lloyd Webber, known for spectacle musicals (see Cats and Starlight Exp…