|Relative key||A♯ minor|
|Parallel key||C♯ minor|
|Notes in this scale|
|C♯, D♯, E♯ (F), F♯, G♯, A♯, B♯ (C), C♯|
Most composers prefer to use the enharmonic equivalent D-flat major because it has just five flats. However, Johann Sebastian Bach actually chose C-sharp major for Prelude and Fugue No. 3 in both books of the Well-Tempered Clavier. In Hungarian Rhapsody No. 6, Franz Liszt changes key from D-flat major to C-sharp major near the beginning of the piece. Maurice Ravel used C-sharp major as the tonic key of Ondine from his piano suite Gaspard de la nuit.
Louis Vierne used C-sharp major in the final piece of Messe solennelle.