Opus 97 Zehn klavierstücke aus dem Ballett-Prokofiev composed his ballet Cinderella between 1940-1944. At the same time he also extracted three sets of pieces from the work transcribed them for Piano and assigned them each a separate Opus number. Opus 97 focuses mainly on the lighter and shorter aspects of Cinderella. A typical performance of these pieces lasts approximately 20 minutes.