Sleeping Beauty, Op. 66, is a ballet by Pyotr Ilyich Tchaikovsky, first performed in 1890. The "Waltz" from Act I, also known as "Once Upon a Dream", is one of the most famous pieces from the ballet and has become a stand-alone concert piece. The ballet is based on Charles Perrault's fairy tale and represents the peak of Russian imperial ballet, combining Tchaikovsky's magnificent score with Marius Petipa's choreography.