A major
A major (or the key of A) 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 the Neapolitan sixth chord on (i.e. the flattened supertonic) requires both a flat and a natural accidental.
| Relative key | F-sharp minor |
|---|---|
| Parallel key | A minor |
| Dominant key | E major |
| Subdominant | D major |
| Component pitches | |
| A, B, C♯, D, E, F♯, G♯ | |
The A major scale is:
In the treble, alto, and bass clefs, the G♯ in the key signature is placed higher than C♯. However, in the tenor clef, it would require a ledger line and so G♯ is placed lower than C♯.
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