A major

A major
{ \magnifyStaff #3/2 \omit Score.TimeSignature \key a \major s16 \clef F \key a \major s^"" }
Relative keyF-sharp minor
Parallel keyA minor
Dominant keyE major
SubdominantD major
Component pitches
A, B, C, D, E, F, G

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 the Neapolitan sixth chord on scale degree 2 (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.