F Add 9
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Fadd9
F – A – C – G
Formula:R-M3-P5-M9
Intervals:P1-M3-P5-M9
Scale Degrees:1-3-5-9
Introduction
The F Add 9 chord is a four-note chord made up of F, A, C, and G. It is built from a root, major third, perfect fifth, and major ninth.
Notes
F Add 9 Inversions
| Position | Notes |
|---|---|
| Root Position | F – A – C – G |
| 1st Inversion | A – C – F – G |
| 2nd Inversion | C – F – G – A |
| 3rd Inversion | F – A – C – G |
Key Signature
The key of F Add 9 has 1 flat.
B♭
Order of flats
Flats are added in a fixed order — the reverse of the sharp order. Each new flat key adds the next flat on the list.
B♭E♭A♭D♭G♭C♭F♭
Mnemonic: Battle Ends And Down Goes Charles’ Father
Chords in the Key of F Major
These are the diatonic triads built on each degree of the F major scale:
C
D
E
F
G
A
B
C
D
E
F
G
A
B
I — F Major (major)
Theory: Intervals
Formula: R-M3-P5-M9
Intervals: P1-M3-P5-M9
The F Add 9 is built by stacking intervals from the root note. The formula R-M3-P5-M9 describes the scale degrees used. The intervals P1-M3-P5-M9 show the distance between each note in the chord.
F Add 9 — Frequently Asked Questions
What notes are in the F Add 9 chord?
The F Add 9 chord (Fadd9) contains four notes: F (root), A (major third), C (perfect fifth), and G (major ninth). No seventh — the ninth adds colour to the major triad.
How does Fadd9 differ from F9?
Fadd9 has no seventh. F9 includes the minor seventh (Eb). Fadd9 is open and bright; F9 is dominant and tense.
How is Fadd9 used in music?
Fadd9 substitutes for F Major anywhere. It is the IV chord add9 in C Major, making it one of the most useful add9 chords in pop music.
What songs use add9 chords?
Add9 chords appear in Wonderwall (Oasis), Good Riddance (Green Day), Yellow (Coldplay), and countless pop songs. Fadd9 as IV in C Major is extremely common.
How does Fadd9 differ from Fsus2?
Both contain F and G. Fadd9 keeps A (major third), while Fsus2 replaces it. Fadd9 is major with colour; Fsus2 is ambiguous.
Can I substitute Fadd9 for F Major?
Yes — Fadd9 replaces F Major beautifully. As IV in C Major, this substitution is ubiquitous in modern pop.
Practice Tips
- Play F Major then add G above — the ninth creates a beautiful, open shimmer.
- Fadd9 is all white keys (F–A–C–G) — one of the easiest add9 chords to play.
- Try Cadd9 → Fadd9 for a gorgeous I–IV movement entirely with add9 voicings.
- Fadd9 as the IV chord in C Major is one of the most popular sounds in modern pop piano.
- Practice the voicing with G on top for maximum brightness and ring.
- Compare Fadd9 with Fmaj7 — both add colour to F Major, but add9 is brighter while maj7 is warmer.
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