A flat ninth piano chord (Ab9)
Also written G#9 (G sharp ninth)
A ninth chord adds a ninth to the seventh chord. A rich, groovy sound, typical of funk, soul and blues.
On the keyboard
Root position
- Notes
- A♭ – C – E♭ – G♭ – B♭
- Fingering (right hand)
- 1 – 2 – 3 – 4 – 5
Chord notes
| Note | Interval |
|---|---|
| A♭ (A flat) | root |
| C | major third |
| E♭ (E flat) | perfect fifth |
| G♭ (G flat) | minor seventh |
| B♭ (B flat) | major ninth |
Formula: 1 – 3 – 5 – b7 – 9 · A♭ – C – E♭ – G♭ – B♭
A progression with this chord
The basis of blues and funk: the ninth chord on the first degree, then on the fourth.