A♭7♯9
A♭7♯9 is the ab dominant 7th sharp 9 chord, spelled A♭ – C – E♭ – G♭ – B. major and minor thirds colliding in one chord — gritty, electric, built for emphatic moments.
The keys
A♭ – C – E♭ – G♭ – B
Practise this chord
Plug in your MIDI keyboard and let Coach Tshepho drill you on A♭7♯9 — it plays the chord, names any wrong notes as you play, and moves you on when you nail it.
Create your free account →What's inside A♭7♯9
| Note | Interval from root | Degree |
|---|---|---|
| A♭ | Root | 1 |
| C | Major 3rd | 3 |
| E♭ | Perfect 5th | 5 |
| G♭ | Minor 7th | b7 |
| B | Sharp 9th | #9 |
A working voicing
Split the chord between two hands the way working players do — a solid shell low down, the colour tones up top:
| Hand | Keys |
|---|---|
| Left (shell) | A♭2 – G♭3 |
| Right (colour) | C5 – B5 |
Where A♭7♯9 lives
Hard resolution
A♭7♯9 → D♭m9
Altered dominants resolve with maximum drama — especially into minor.
Chromatic approach
E♭m7 → A♭7♯9 → D♭
The alteration sharpens the pull of the standard two-five.
Put A♭7♯9 under your fingers
Hear every voicing, see the keys light up, and drill it in the interactive Chord & Voicing Lab.
Open the Chord & Voicing Lab →More Ab chords
A♭
A♭m
A♭dim
A♭aug
A♭sus2
A♭sus4
A♭6
A♭m6
A♭7
A♭maj7
A♭m7
A♭m7♭5
A♭dim7
A♭m(maj7)
A♭9
A♭maj9
A♭m9
A♭add9
A♭6/9
A♭m11
A♭13
A♭7♭9
A♭7♯5Play it over a groove
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