関連ワード:  what is the key of c major    what is the key signature of c major    what is the minor key of c major    what is the relative key of c major    what is the dominant key of c major    what is the octave key of c major scale    what is the parallel key of c major    what is the root key of c major scale    what is the key signature of c major scale    what is the subdominant key of c major