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
Quartet Movement in E-flat major (Shostakovich) Quartet Movement in E-flat major (Shostakovich) The Quartet Movement in E-flat major, also known as the Unfinished Quartet, is the first movement of a projected string quartet in E-flat major by Dmitri Shostakovich, that was rediscovered in 2003. Shostakovich's Ninth String Quartet had a difficult creation process, with at least one completed version being destroyed by the composer in 1961, as described by Elizabeth Wilson in her biography "Shostakovich: A Life Remembered", "Shostakovich finished the first version of the Ninth Quartet in the autumn of 1961. In a fit of depression, or, to quote his own words, 'in an attack