A9 Chord (A Dominant 9th Chord) on Piano & Guitar
A piano keyboard reference for the
A dominant 9th chord, abbreviated as
Adom9, with the notes on piano.
The A dominant 9th chord has the notes A C♯ E G B.
The A9 chord is a A dominant 7th chord (A7 chord), with a major ninth added on top.
The intervals of the A9 chord are the root (A) , major third (C♯) , perfect fifth (E) , minor seventh (G) and major ninth (B) .
Dominant 9th chords are 5-note chords and the 9th falls on the next octave. That means that they can often be impractical to play unmodified. For this reason, the 9th is often played at the 2nd scale degree position instead. You'll also often see the 3rd or the 5th being omitted from dominant 9th chords.
Below you can see and play the A9 chord on the piano, in its unmodified version as well as without the 3rd, without the 5th or with the 9th in 2nd degree position.
🎸 You can also jump to guitar chord diagrams for the A9 chord in common positions on the guitar fretboard. You'll find both open chords and/or barre chords.
A dominant 9th Chord on Piano
⌨️ hint: use numbers 1 to 4 on a computer keyboard to trigger the A9 chord and common variations.
A dominant 9th chord
notes: A C♯ E G B
A dominant 9th, 9th in 2nd position
notes: A B C♯ E G
A dominant 9th chord, no3
notes: A E G B
A dominant 9th chord, no5
notes: A C♯ G B
🎸 A dominant 9th Chord Guitar Diagrams
Below you'll find guitar chord diagrams for common chord positions of the A dominant 9th chord, along with finger positions or note names.
lookup a different chord
Minor ChordsCmin C♯min D♭minDminD♯minE♭minEminFminF♯minG♭minGminG♯minA♭minAminA♯minB♭minBmin
Diminished ChordsCdim C♯dimDdimD♯dimE♭dimEdimFdimF♯dimGdimG♯dimAdimA♯dimB♭dimBdim
Augmented ChordsCaug C♯aug D♭augDaugD♯augE♭augEaugFaugF♯augG♭augGaugG♯augA♭augAaugA♯augB♭augBaug
Dominant 7th and 9th ChordsC7D7E7F7G7A7B7 C♯7E♭7F♯7A♭7B♭7C9D9E9F9G9B9 C♯9E♭9F♯9A♭9B♭9
Suspended ChordsCsusDsusEsusFsusGsusAsusBsus C♯susD♯susF♯susG♯susA♯sus
The piano samples used for this A9 chord reference are from “ Salamander Grand Piano V3 ” by Alexander Holm, licensed under CC BY 3.0.
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