G-sharp major

G♯ major

Relative key	E♯ minor enharmonic: F minor
Parallel key	G♯ minor
Dominant key	D♯ major enharmonic: E♭ major
Subdominant	C♯ major enharmonic: D♭ major
Enharmonic	A♭ major
Component pitches
G♯, A♯, B♯, C♯, D♯, E♯, F, G♯

G-sharp major is a theoretical key based on the musical note G-sharp, consisting of the pitches G♯, A♯, B♯, C♯, D♯, E♯ and F. Its key signature has six sharps and one double sharp.^[1]

For clarity and simplicity, G-sharp major is usually notated as its enharmonic equivalent of A-flat major. However, it does appear as a secondary key area in several works in sharp keys - most notably in the Prelude and Fugue in C-sharp major from Johann Sebastian Bach's The Well-Tempered Clavier, Book 1. The G-sharp minor prelude (and, in some editions, the fugue) from the same set ends with a Picardy third, on a G-sharp major chord.

G-sharp major is tonicised briefly in several of Frédéric Chopin's nocturnes in C-sharp minor. A section in the second movement of Chopin's Piano Concerto No. 1 is in G-sharp major, although the key signature has 4 sharps. The end of the exposition of the second movement Charles-Valentin Alkan's Grande sonate 'Les quatre âges', subtitled Quasi-Faust, is in G-sharp major, albeit written with a six-sharp key signature (the movement opens in D-sharp minor and ends in F-sharp major).

The final pages of A World Requiem by John Foulds are written in G-sharp major with its correct key signature shown in the vocal score including the F.

References

1. Thomas Busby (1840). "G Sharp Major". A dictionary of three thousand musical terms. revised by J.A. Hamilton. London: D'Almaine and Co. p. 55.

Scales and keys