Sorabji, Kaikhosru Shapurji. (1892 - 1988) Opus Clavicembalisticum - SIGNED FIRST EDITION OF ONE OF THE LONGEST SOLO PIANO WORKS EVER COMPOSEDRare signed copy of the notoriously long and virtuosic piano work. Signed and inscribed to Carl Engel, French born American pianist, musicologist and publisher. Engel was also a writer on music for The Musical Quarterly, and chief of the Music Division of the Library of Congress. At the time of its first performance in 1930, the Opus Clavicembalisticum was the longest piano solo work ever composed, taking over four hours to play. It is one of the most