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
Sonata No. 6 in E-flat major (J. C. F. Bach) and finally, the piece repeats its original tune. Further on, there is a modulation to A flat major, where the main theme is repeated. The piece ends with the last three-quarters of the original motif, its repeat and a modulation back to the original key of E flat major. This piece is currently on the 2009-2010, Grade 7 Piano syllabus of the Associated Board of the Royal Schools of Music Sonata No. 6 in E-flat major (J. C. F. Bach) Sonata No. 6 in E-flat major WXI/3 is a sonata written for keyboard by Johann Christoph Friedrich Bach. The piece