Tchaikovsky Pas de Deux
The music for this pas de deux was originally intended for the pas de deux in Act III of Swan Lake. Because it is not published with the rest of the score, it remained unknown to Petipa and Ivanov when they were preparing to stage the St. Petersburg version. They substituted music from Act I that became the famous Black Swan pas de deux. The music lay unnoticed in the Tchaikovsky Museum in Klin until it was discovered by the efforts of the Tchaikovsky Foundation of New York and George Balanchine.