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 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 A major scale is:

$\header { tagline = ##f } scale = \relative a { \key a \major \omit Score.TimeSignature a'^"A natural major scale" b cis d e fis gis a gis fis e d cis b a2 \clef F \key a \major } \score { { << \cadenzaOn \scale \context NoteNames \scale >> } \layout { } \midi { } }$

Changes needed for the melodic and harmonic versions of the scale are written in with accidentals as necessary. The A harmonic major and melodic major scales are:

$\header { tagline = ##f } scale = \relative a { \key a \major \omit Score.TimeSignature a'^"A harmonic major scale" b cis d e f gis a gis f! e d cis b a2 \clef F \key a \major } \score { { << \cadenzaOn \scale \context NoteNames \scale >> } \layout { } \midi { } }$

$\header { tagline = ##f } scale = \relative a { \key a \major \omit Score.TimeSignature a'^"A melodic major scale" b cis d e fis gis a g f e d cis b a2 \clef F \key a \major } \score { { << \cadenzaOn \scale \context NoteNames \scale >> } \layout { } \midi { } }$

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♯.