Schubert Piano Sonata n. 16 in A minore, D. 845

The Piano sonata in A minor D. 845, Op. 42 by Franz Schubert is a work for solo piano, composed in May 1825 and dedicated to Erzherzog Rudolf von Österreich. The first movement is in sonata form though with ambiguity over the material in the development and the beginning of the recapitulation. The second movement is in variation form.