嬰ハ長調
Most composers prefer to use the enharmonic equivalent D-flat major since it only contains five flats as opposed to C-sharp major's seven sharps. However, Johann Sebastian Bach chose C-sharp major for Prelude and Fugue No. 3 in both books of "The Well-Tempered Clavier, and" Charles-Valentin Alkan chose C-sharp major for Etude Op. 35 No. 9 "Contrapunctus" in "Twelve etudes in all the major keys", Op. 35. In Hungarian Rhapsody No. 6, Franz Liszt takes the unusual step of changing the key from D-flat major to C-sharp major near the beginning of the piece, and then soon back again to D-flat major. Maurice Ravel selected C-sharp major as the tonic key of "Ondine" from his piano suite "Gaspard de la nuit". Erich Wolfgang Korngold composed his Piano Concerto for the Left Hand, Op. 17, in the key of C-sharp major.