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G-sharp (G#) is the note G raised by one semitone using a sharp (#). On the piano, G-sharp is played on the same key as A-flat.
What is G-sharp?
G-sharp is enharmonically equivalent to A-flat (A♭) in the equal temperament tuning system. Although both notes sound identical, G-sharp is written when the harmonic or melodic context requires the note to remain a form of G.
G-sharp appears in key signatures such as E major and C-sharp minor, where correct note spelling is important for reading scales, chords and harmonic progressions.
How is G-sharp used in piano playing?
On the piano, G-sharp is the first black key in the group of three black keys. Although it shares the same key as A-flat, recognizing when to think of the note as G-sharp helps pianists read music accurately and understand sharp key signatures.
Understanding G-sharp improves music-reading skills and strengthens a pianist’s knowledge of harmony, enharmonic spelling and key signatures.