Ces major is a key of the major tonal family, based on the root Ces. The key of Ces major is written in musical notation with seven (b, es, as, des, ges, ces, fes). The corresponding scale and the fundamental chord of this key (the tonic ces-es-ges) are also designated by the term Ces major.

Vorzeichen Ces-DurCDEFGAHCDEFGAH

Because of the seven accidentals (one could represent Ces major - enharmonically reinterpreted - more simply with B major), this key is rarely used.