 Some composers, most notably Schubert, composed sonata forms with three or more key areas.The first movement of Schubert's Quartet in D minor, D. 810 ("Death and the Maiden"), for example, has three separate key and thematic areas, in D minor, F major, and A minor.Similarly, Chopin's Piano Concerto in F minor uses F minor, A major, and C minor in its first movement's exposition.