D major (or the key of D) is a major scale based on D, consisting of the pitches D, E, F♯, G, A, B, and C♯. Its key signature has two sharps. Its relative minor is B minor and its parallel minor is D minor.
Relative key: B minor
Parallel key: D minor
Subdominant: G major
A major is a major scale based on A, with the pitches A, B, C♯, D, E, F♯, and G♯. Its key signature has three sharps. Its relative minor is F-sharp minor and its parallel minor is A minor. The key of A major is the only key where a Neapolitan sixth chord on {\hat {2}} requires both a flat and a natural accidental.
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Answer:
D major (or the key of D) is a major scale based on D, consisting of the pitches D, E, F♯, G, A, B, and C♯. Its key signature has two sharps. Its relative minor is B minor and its parallel minor is D minor.
Relative key: B minor
Parallel key: D minor
Subdominant: G major
A major is a major scale based on A, with the pitches A, B, C♯, D, E, F♯, and G♯. Its key signature has three sharps. Its relative minor is F-sharp minor and its parallel minor is A minor. The key of A major is the only key where a Neapolitan sixth chord on {\hat {2}} requires both a flat and a natural accidental.