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C♭ major is a major scale based on C♭, consisting of the pitches C♭, D♭, E♭, F♭, G♭, A♭, and B♭....

C♭ 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 — the enharmonically equivalent key signature B major (five sharps) is usually used instead. (see below: Scales and keys). C♭ 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 (a white key on a keyboard instrument). Its relative minor is A♭ minor, and its parallel minor is C♭ minor, usually replaced by B minor, since C♭ minor's three double-flats make it impractical to use. However, there is a brief passage in the first movement, "Evocación", of Iberia by Isaac Albéniz which suggests the key of C♭ minor by adding the necessary double-flats as accidentals. The surrounding passages are in C♭ major, with a 7-flat key signature. C♭ major is the home key of the harp, with all its pedals in the top position, and it is considered the most resonant key for the instrument. Thus, in Richard Strauss's Ein Heldenleben, the first cue for the harps is written in C♭ major even though the rest of the orchestra, having previously played in E♭