Gb Dominant Thirteen Sharp Ninth (Gb13(#9)) chords on guitar
Written with flats, Gb13(#9) (Gb thirteenth sharp nine) contains Gb, Bb, Db, Fb, A, Cb and Eb.
It sounds identical to F#13(#9), the same chord under a different spelling. The A is the sharp ninth, a raised Ab, and it sits a minor third above the root. The Gb Half-Whole scale contains every chord tone except the eleventh.
The major third Bb and the minor seventh Fb sit a tritone apart, which is the engine of every dominant chord. Counted from the root Gb, the symbol adds a sharp ninth and a thirteenth to the dominant seventh.
Gb 13th with sharp 9th guitar chord is also written as Gb13(#9), Gb13#9 or Gb13+9.
Notes that compose the Gb 13(#9) chord:
Tones in the Dominant Thirteen Sharp Ninth chord:
Formula: 1 3 5 b7 #9 11 13
Gb 13(#9) Chord Interactive Fretboard
Want a structured chord roadmap instead of jumping between pages?
Go to the full guitar chords tutorial.
Download
the Free Guitar Chords Chart Pdf
Created by
Giancarlo is a musician (teaching guitar since 2000), software engineer, AI consultant and published researcher
FAQ
What are the notes in Gb13(#9)?
Gb13(#9) is spelled Gb, Bb, Db, Fb, A, Cb and Eb. It stacks a major third, perfect fifth, minor seventh, sharp ninth, eleventh and thirteenth on Gb.
Is Gb13(#9) the same chord as F#13(#9)?
Yes, they sound identical. F#13(#9) spells the pitches F#, A#, C#, E, G##, B and D#, so only the notation differs.
Why is the sharp ninth of Gb13(#9) written A?
The major ninth over Gb is Ab. Raising it by a half step gives A natural, which is the sharp ninth and sounds like a minor third.
What scale can I play over Gb13(#9)?
The Gb half-whole scale has every chord tone except the eleventh, Cb. The A in the scale lines up with the sharp ninth.
