 The collection also includes notation created by students.After the Russian Revolution of 1917, Nicholas Sergeyev left Russia with a great number of the notated choreographies.In 1920 he was invited by Sergei Diaghilev to stage the Petipa/Tchaikovsky "The Sleeping Beauty" from the notations for the Ballets Russes in Paris, but Diaghilev's insistence on altering passages of Petipa's choreography apparently caused Sergeyev to withdraw his services.