This comes from "The Tale of Tsar Saltan", an opera composed in 1899-1900. It's a popular piece that closes Act II, Tableau 1, where the magic Swan-Bird changes the prince into an insect so that he can fly away to visit his father. In the opera, the swan actually sings during the first part of the flight, but this is removed for most arrangements. I still enjoy playing this piece, but my fingers don't work like they used to in my youth. Hopefully you enjoy it.