G-flat major Rondo-Finale of his Seventh Symphony. Mahler's Tenth Symphony was composed in the enharmonic key of F-sharp major. This key is more often found in piano music, as the use of all five black keys allows an easier conformity to the player's hands, despite the numerous flats. Austrian composer Franz Schubert chose this key for his third impromptu from his first collection of impromptus (1827). Polish composer Frédéric Chopin wrote two études in the key of G-flat major: Étude Op. 10, No. 5 "Black Key" and Étude Op. 25, No. 9 "Butterfly". French composer Claude Debussy used this key for one
Sinfonia in B-flat major for two oboes, two horns and strings as part of a project to record music from the private collection of Bertel Thorlvaldsen. The music from both pieces is almost exactly the same except for the change in solo instruments. Sinfonia in B-flat major for two oboes, two horns and strings Sinfonia in B-flat major for 2 oboes, 2 horns and strings is one of several instrumental works by Domenico Cimarosa. The parts for this particular Sinfonia are located in the Zentralbibliothek in Solothurn, Switzerland. The instrumentation of this work was written perfectly for the orchestras in Naples which maintained two oboes, two trumpets (who doubled on horn),