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
Music of Mesopotamia same key signature as a C-major scale. The F-Major scale has a B-flat in the key signature, however with the raised fourth in the lydian scale, the B-flat becomes a B-natural. The drawback in modern music with the lydian scale is the use of what's known today as the "devil's tritone," however, the Mesopotamians don't seem to have a term for this interval, nor a term for the octave which we know they had a concept of. The use of a heptatonic scale would have eliminated any practical need for a term for the octave, as it wouldn't have the