F9 chord on piano
The F9 chord, or F dominant 9th, stacks 5 notes on F: F, A, C, E♭ and G. Musicians write its formula 1 3 5 ♭7 9.
Notes and intervals of F9
Each note of F9 has a job. Counted from the root, you get root (F), major 3rd (A), perfect 5th (C), minor 7th (E♭) and major 9th (G). Change one of these intervals and you get a different chord, which is why the formula 1 3 5 ♭7 9 is worth memorising rather than the shape alone.
| Degree | Interval | Note |
|---|---|---|
| 1 | root | F |
| 3 | major 3rd | A |
| 5 | perfect 5th | C |
| ♭7 | minor 7th | E♭ |
| 9 | major 9th | G |
How to play F9 on piano
Put your right-hand thumb on F, then add the other notes: F, A, C, E♭ and G. Teachers usually suggest the fingering 1-2-3-4-5 (left hand: 5-4-3-2-1). Press the keys together, release, and repeat until the chord sounds even.
Inversions of F9
An inversion keeps the same notes but puts another one in the bass. F9 has 3 inversions besides root position: 1st inversion (A C E♭ G F), 2nd inversion (C E♭ G F A) and 3rd inversion (E♭ G F A C). Inversions let you move between chords with tiny hand movements, which is how pianists make progressions sound smooth.
Which keys use F9?
F9 is not built from the notes of a single major key, so it usually appears as a colour chord: a borrowed chord, a passing chord or a suspension that resolves to the next chord.
Scales to play over F9
These scales share every note of F9: F Mixolydian mode. F Mixolydian mode is the safest choice; the others add more colour.
About dominant 9th chords
A dominant seventh with a 9th on top: 1 3 5 ♭7 9. It keeps the tension of the 7 chord but sounds fuller, smoother and funkier, as the major ninth softens the tritone between 3 and ♭7. It belongs to the extended chords, built by stacking thirds beyond the seventh. For example C9: C E G B♭ D.
Use it wherever a V7 works: V9 to I, the dominant in ii7 V9 Imaj7, and every chord of a blues (I9 IV9 V9). Funk can sit on one 9 chord for a whole groove, and soul, gospel and jazz use it as a richer dominant. In minor keys, V7♭9 is more common than V9, because the scale has a ♭6.
Five notes are a lot: drop the fifth first, and the root too when a bass player has it. A classic split: root and ♭7 in the left hand, 3, 5 and 9 in the right. Rootless voicings such as 3 5 ♭7 9 or ♭7 9 3 5 are the standard jazz piano sound for dominant chords.
9 is not add9: a 9 chord has the ♭7, an add9 does not. 9 is not maj9 either: maj9 has the major seventh and a calm, non-dominant sound. And the 9 is a major ninth; ♭9 and ♯9 (as in E7♯9, the 'Hendrix chord') are altered versions with their own symbols.
Frequently asked questions
What notes are in the F9 chord?
F9 (F dominant 9th) contains F, A, C, E♭ and G. In intervals: root (F), major 3rd (A), perfect 5th (C), minor 7th (E♭) and major 9th (G).
How do you play F9 on piano?
Play F, A, C, E♭ and G together with the right-hand fingering 1-2-3-4-5. You can also play it in 3 inversions, shown on this page.
What scale goes with F9?
F Mixolydian mode fits F9 best. Other scales that contain all its notes: F Mixolydian mode.
What key is F9 in?
F9 does not belong to a single major key. It is used as a colour chord that borrows notes from outside the key.
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