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
E-flat major E-flat major. For Mozart, E-flat major was associated with Freemasonry, "E-flat evoked stateliness and an almost religious character." E-flat major E-flat major (or the key of E-flat) is a major scale based on E, with the pitches E, F, G, A, B, C, and D. Its key signature has three flats: B, E, and A. Its relative minor is C minor, while its parallel minor is E minor (or enharmonically D minor). The E-flat major scale is: \override Score.TimeSignature #'stencil = ##f \relative c' { </score> The key of E-flat major is often associated with bold, heroic music, in part