 The two inherited part of Diaghilev's archives and collections, which Kochno completed and part of which was acquired by the Bibliothèque nationale de France.In 1933 he co-founded, together with George Balanchine, the short-lived but history-making company Les Ballets 1933, which made its debut that summer at the Théâtre des Champs-Élysées.That same year, he and Edward James commissioned Brecht and Weill's last collaboration, "The Seven Deadly Sins", which Balanchine produced, directed, and choreographed.