Schumann, Robert. (1810–1856) & Schubert, Franz. (1797–1828) & Mendelssohn-Bartholdy, Felix. (1809–1847) & Gade, Niels. (1817–1890) & Schulhoff, Julius. (1825–1898) Sammelband of Works for Piano 4 Hands, including First EditionsSammelband containing 8 pieces of printed music for piano 4 hands, including first editions of works by Schumann, Gade and Schulhoff and early editions by Schubert and Mendelssohn. Of particular rarity and interest is the first edition arrangement of the Piano Quintet of Robert Schumann by his wife, the virtuoso pianist and composer Clara Schumann. In a letter to publisher Hermann Hrtel (October 25, 2857), she writes: "I had mentioned to you once