Capriccio, Op. 85, is the final opera by German composer Richard Strauss, subtitled "A Conversation Piece for Music". It received its premiere performance at the Nationaltheater München on 28 October 1942. Strauss and Clemens Krauss wrote the German libretto, but its genesis came from Stefan Zweig in the 1930s, and Joseph Gregor further developed the idea several years later. Strauss then took it on, but finally recruited Krauss as his collaborator. Most of the final libretto is by Krauss. The opera originally consisted of a single act lasting close to two and a half hours. This, in combination with the work's conversational tone and emphasis on text, has prevented it from achieving great popularity. But at Hamburg in 1957, Rudolf Hartmann, who directed the opera at its premiere in Munich, inserted an interval at the point when the Countess orders chocolate, and other directors have often followed suit, including performances at Glyndebourne Festival Opera. The final scene for Countess Madeleine is often heard as an excerpt. Capriccio received its American professional premiere at The Santa Fe Opera in 1958 after the Juilliard School staged it in 1954 with Gloria Davy and Thomas Stewart as the aristocratic siblings.