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
In scale In scale The in" scale (also known as the Sakura" pentatonic scale due to its use in the well-known folk song "Sakura Sakura") is, according to a traditional theory, one of two pentatonic scales used in much Japanese music, excluding "gagaku" and Buddhist chanting. The "in" scale, which contains minor notes, is used specifically in music for the "koto" and "shamisen" and is contrasted with the "yo" scale, which does not contain minor notes. More recent theory emphasizes that it is more useful in interpreting Japanese melody to view scales on the basis of "nuclear tones" located a fourth apart