Ballets Russes, and the enduring dancing man

Midnight in Paris. (A real one.) It's May 1922. There's a dazzling soiree going on at the Hotel Majestic: Picasso is there, and so is Stravinsky. Serge Diaghilev, head of the Ballets Russes, is the ringleader at this after-party for the premiere of "Le Renard" ("The Fox"), for which Stravinsky wrote the score.