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
Magnificat in E-flat major, BWV 243a Magnificat in E-flat major, BWV 243a The in E-flat major, 243a, also BWV243.1, by Johann Sebastian Bach is a musical setting of the Latin text of the Magnificat, Mary's canticle from the Gospel of Luke. It was composed in 1723 and is in twelve movements, scored for five vocal parts (two sopranos, alto, tenor and bass) and a Baroque orchestra of trumpets, timpani, oboes, strings and basso continuo including bassoon. Bach revised the work ten years later, transposing it from E-flat major to D major, and creating the version mostly performed today, BWV 243. The work was first performed in