Piano · seventh sharp nine
A♭7♯9 Chord on Piano
Ab Dominant 7♯9 (Hendrix) is Ab, C, Eb, Gb, B — the 1-3-5-b7-#9 pattern of a seventh sharp nine chord. There are 4 ways to play it on piano, ranked below from easiest to hardest.
Every voicing below is the same 5 notes in a different order. Root position is the one to learn first; the inversions exist to keep your hand still when you change chords.
Start here — Root Position (RH)
Root position — the root is the lowest note. This is the sound in your head when you read the chord symbol, and the one to learn first.
Ways to voice it — 4 voicings, easiest first
Same 5 notes in all of them. What changes is which one sits at the bottom — and how far your hand has to travel to get there.
Way 1 of 4
Root Position (RH)
Easiest here· intermediate· the standard shape
Root position — the root is the lowest note. This is the sound in your head when you read the chord symbol, and the one to learn first.
Keys: Ab4 · C5 · Eb5 · Gb5 · B5
Way 2 of 4
1st Inversion (RH)
intermediate
First inversion — the 3rd (C) moves to the bottom. Reach for it when the chord before this one sat a step below: your hand barely travels.
Keys: C4 · Eb4 · Gb4 · Ab4 · B4
Way 3 of 4
2nd Inversion (RH)
intermediate
Second inversion — the 5th (Eb) is in the bass. It leans forward instead of settling, which makes it a good passing chord.
Keys: Eb4 · Gb4 · Ab4 · B4 · C5
Way 4 of 4
Spread Voicing (Both)
advanced
Root position — the root is the lowest note. This is the sound in your head when you read the chord symbol, and the one to learn first.
Keys: Ab3 · C4 · Eb4 · Gb4 · B4
What beginners get wrong
Moving in and out of it
The shape above: Root Position (RH).
Listening: each shape above has its own play button, and each one plays the notes that shape actually produces — not a generic triad.
Ab7#9 on other instruments
Same notes, different hands. Every link below is a real page with diagrams and audio.
Or see Ab Dominant 7♯9 (Hendrix) on every instrument at once.
Chords next door
Same root, different colour — and all of them playable on piano.
Ab7#9 on Piano — questions people ask
What is the easiest way to play Ab7#9 on piano?
“Root Position (RH)” — which we rate intermediate — is the easiest Ab7#9 shape on piano. Root position — the root is the lowest note. This is the sound in your head when you read the chord symbol, and the one to learn first.
What notes are in the Ab Dominant 7♯9 (Hendrix) chord?
Ab Dominant 7♯9 (Hendrix) is Ab, C, Eb, Gb, B — the 1-3-5-b7-#9 interval pattern of a seventh sharp nine chord. Every voicing on this page uses those notes and nothing else; they just appear in a different order and octave.
How many ways can you play Ab7#9 on piano?
This page has 4 Ab7#9 voicings for piano, ranked from easiest to hardest: Root Position (RH), 1st Inversion (RH), 2nd Inversion (RH), Spread Voicing (Both). They all sound like Ab7#9; the differences are how hard they are to hold and how high they sit.
What can I play instead of Ab7#9?
The nearest stand-ins on piano that keep the same root are Ab5, Absus4, Absus2. They keep the root and the fifth and only change what sits in the middle, so most songs still work — but check the swap against the melody, because the note you removed may be the one the tune is singing.
Can I play Ab7#9 on other instruments?
Yes. Ab7#9 is the same set of notes everywhere; only the fingering changes. This site has diagrams and audio for it on guitar.
Learn the theory behind Ab7#9
The shape gets your fingers there. These explain why it sounds the way it does.