In addition to some 47 keyboard sonatas, Haydn wrote a variety of other pieces including arrangements of earlier orchestral or chamber works, and dances intended for occasional use. The 10 kleine Klavierstücke (10 Little Piano Pieces) contain five symphonic movements–including the second movement from one of his most popular, No. 53 in D major, known as L’Impériale–a single movement from a string quartet and three extracts from his witty Eszterháza opera La vera costanza. The dance movements were popular in Vienna’s many ballrooms.