Swan Lake
Riccardo Drigo was the conductor of the Mariinsky orchestra. He dropped some numbers from the ballet. He orchestrated three piano numbers from Tchaikovsky's Op. 72. He then put them in the ballet. These three numbers were "L'Espiègle", "Valse Bluette", and "Un poco di Chopin". He then put a number into Act 3 which he may have written himself.