The Violin Sonata No. 4 (also known as the “Duo” or “Grand Duo”) in A Major, Op. posth. 162, D 574, for violin and piano by Franz Schubert was composed in 1817. This sonata, composed one year after his three sonatinas for the same instruments, is a much more individual work, showing neither the influence of Mozart, as in the sonatinas, or of Rossini, as in the contemporaneous 6th Symphony.