Graaf, Christian Ernst. (1723-1804) Duo Economique pour Un Violon a Deux Mains et Deux Archets. Oeuvre XXVII.Title; 2 3; 2 3. Engraved. No PN. RISM G 3356a. An extraordinary and unusual work for two violinists to perform on a single violin the first part to be played on the upper 2 strings, while the second part to be played (simultaneously!) on the lower two. Very rare, only 2 copies listed by OCLC and both in the Netherlands. "Composer and violinist, son of Johann Graf. He began his career at the Rudolstadt court. In January 1751 he performed at Arnhem,