C major (or the key of C) is a major scale based on C, consisting of the pitches C, D, E, F, G, A, and B. C major is one of the most common keys used in music. Its key signature has no flats or sharps. Its relative minor is A minor and its parallel minor is C minor. The C major scale is: Audio playback is not supported in your browser. You can . On the piano, the C major scale can be played by playing only the white keys starting on C.