A#9(#11) Guitar Chord | How to Play The A# Dominant Ninth Sharp Eleventh Added Chord
The A#9(#11) chord, also read as A# ninth sharp eleven, is spelled A#, C##, E#, G#, B# and D##: a root, a major third, a perfect fifth, a minor seventh, a ninth and a sharp eleventh.
The double sharps look heavy, but they are only the result of stacking thirds above A#. These are the same pitches as Bb9(#11), so the two names sound identical. For soloing, the A# Lydian Dominant scale contains all six chord tones and adds just a sixth.
As a dominant chord it usually resolves to the chord a fourth above A#.
A# 9th with sharp 11th guitar chord is also written as A#9(#11), A#9#11 or A#9+11.
Notes that compose the A# 9(#11) chord:
Chord Structure:
Formula: 1 3 5 b7 9 #11
A# 9(#11) 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 notes are in A#9(#11)?
A#9(#11) contains A#, C##, E#, G#, B# and D##. They are the root, major third, perfect fifth, minor seventh, ninth and sharp eleventh counted from A#.
Is A#9(#11) the same chord as Bb9(#11)?
Yes, both names use the same six pitches. Bb9(#11) spells them Bb, D, F, Ab, C and E, which is easier to read, while A#9(#11) keeps the sharp spelling of the root.
Why does A#9(#11) contain two double sharps?
Chord tones are named by stacking letters in thirds from the root. From A#, the third falls on the letter C and the eleventh on D, so the major third becomes C## and the sharp eleventh becomes D##.
Which scale fits A#9(#11)?
The A# Lydian Dominant scale spells A#, B#, C##, D##, E#, F## and G#. It covers all six chord tones and adds only F## as an extra note.
