C-flat major

C-flat major is a major scale based on C♭, consisting of the pitches C♭, D♭, E♭, F♭, G♭, A♭, and B♭. Its key signature has seven flats. Its relative minor is A-flat minor (or enharmonically G-sharp minor). Its parallel minor, C-flat minor, is usually rewritten as B minor, since C-flat minor's three double-flats make it impractical to use. The direct enharmonic equivalent of C-flat major is B major, a key signature with five sharps.

Changes needed for the melodic and harmonic versions of the scale are written in with accidentals as necessary. The C-flat harmonic major and melodic major scales are:

C-flat major is the only major or minor key, other than theoretical keys, which has "flat" or "sharp" in its name, but whose tonic note is the enharmonic equivalent of a natural note, B (a white key on a keyboard instrument).