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
G-flat major and Winding used G-flat major over F-sharp major, but this does not affect the integrity of the scheme as the key sequence breaks down. Muzio Clementi chose G-flat for the "Grande Exercice" and F-sharp for the prelude. Antonín Dvořák composed Humoresque No. 7 in G-flat major, while its middle section is F-sharp minor. Gustav Mahler was fond of using G-flat major in key passages of his symphonies. Examples include: the choral entry during the finale of his Second Symphony, during the first movement of his Third Symphony, the modulatory section of the Adagietto from his Fifth Symphony, and during the