A major

A major
${ \magnifyStaff #3/2 \omit Score.TimeSignature \key a \major s16 \clef F \key a \major s^"" }$
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♯

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.

The A major scale is:

${ \omit Score.TimeSignature \relative c'' { \key a \major \time 7/4 a b cis d e fis gis a gis fis e d cis b a2 \clef F \key a \major } }$

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♯.