Sonata in C major, D.812, op. posth.140, "Grand Duo"

Franz Schubert wrote his Sonata in C major for piano four-hands, D 812, in June 1824 during his second stay at the Esterházy estate in Želiezovce. The extended work, in four movements, has a performance time of around 40 to 45 minutes. It was published as Grand Duo, Op. 140, in 1837, nine years after the composer's death.