For 10 points, name this Austrian composer of the Unfinished symphony.
The first movement of his incomplete 12th string quartet is called Quartettsatz, and his piano sonatas include ones nicknamed "Relique" and "Gasteiner." He depicted a guy drowning himself after his love the miller's daughter is seduced by a hunter in green in his song cycle Die schöne Müllerin and wrote a collection of short piano pieces titled Six moments musicaux. A rising sextuplet motif represents a leaping fish in his work Trout Quintet and the third movement of his most famous work might have been used for his incidental music to Rosamunde which would explain why it was left as a fragment of a scherzo with the first two movements complete. For 10 points, name this Austrian composer of the Unfinished symphony.
The first movement of his incomplete 12th string quartet is called Quartettsatz, and his piano sonatas include ones nicknamed "Relique" and "Gasteiner."
Franz Peter {Schubert}