A major

Relative key	F♯ minor
Parallel key	A minor
Component pitches
A, B, C♯, D, E, F♯, G♯, A

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 a Neapolitan sixth chord on requires both a flat and a natural accidental.

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♯.

Although not as rare in the symphonic literature as sharper keys, examples of symphonies in A major are not as numerous as for D major or G major. Beethoven's Symphony No. 7, Bruckner's Symphony No. 6 and Mendelssohn's Symphony No. 4 comprise a nearly complete list of symphonies in this key in the Romantic era. Mozart's Clarinet Concerto and Clarinet Quintet are both in A major, and generally Mozart was more likely to use clarinets in A major than in any other key besides E-flat major.^[1]

A major occurs frequently in chamber music. Franz Schubert's Piano Quintet known as the Trout Quintet and Antonín Dvořák's Piano Quintet No. 2 are both in A major. Johannes Brahms, César Franck, and Gabriel Fauré wrote violin sonatas in A major. In connection to Beethoven's Kreutzer Sonata, Peter Cropper said that A major "is the fullest sounding key for the violin."^[2]

According to Christian Friedrich Daniel Schubart, A major is a key suitable for "declarations of innocent love, ... hope of seeing one's beloved again when parting; youthful cheerfulness and trust in God."^[3]

  Ascending and descending A major scale  Play in just intonation (help·info).

For orchestral works in A major, the timpani are typically set to A and E a fifth apart, rather than a fourth apart as for most other keys. Hector Berlioz complained about the custom of his day in which timpani tuned to A and E a fifth apart were notated C and G a fourth apart, a custom which survived as late as the music of Franz Berwald.^[4]

Notable pop songs in the the key of A major include Lady Madonna by the Beatles, Someone Like You by Adele and Beautiful Day by U2.

  References

1. ^ Mark Anson-Cartwright, "Chromatic Features of E♭-Major Works of the Classical Period" Music Theory Spectrum 22 2 (2000): 178
2. ^ Peter Cropper "Beethoven's Violin Sonata in A major, Op.47 'Kreutzer': First Movement" The Strad March 2009, p. 64
3. ^ Rita Steblin: A History of Key Characteristics in the Eighteenth and Early Nineteenth Centuries (Rochester, University of Rochester Press: 1996) p. 123
4. ^ N. D. Mar (1981). Anatomy of the Orchestra University of California Press, p. 349

• Colin Lawson, Mozart: Clarinet Concerto, A Cambridge Music Handbook, Cambridge University Press, 1996.

  Scales and keys

Diatonic scales and keys
	Flats Sharps Major minor Major minor 0 C a C a 1 F d G e 2 B♭ g D b 3 E♭ c A f♯ 4 A♭ f E c♯ 5 D♭ b♭ B g♯ 6 G♭ e♭ F♯ d♯ 7 C♭ a♭ C♯ a♯ 8 F♭ d♭ G♯ e♯
The table indicates the number of sharps or flats in each scale. Minor scales are written in lower case.

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