F9#11

Q: What notes are in the F9#11 chord?

The F9#11 chord (F 9#11) contains: F, A, C, Eb, G, B. Its interval structure is shown above in the Theory section.

Q: How do I build F9#11 on the keyboard?

Take the root and add the remaining chord tones following the interval formula. The highlight shows chord content, while the inversion control changes which chord tone is in the bass.

Q: Which keys is F9#11 found in?

The chord acts as a diatonic degree in several keys — they are marked on the circle of fifths in the "Harmonic context" block.

Q: What can I substitute for F9#11?

A substitution depends on harmonic function and voice leading, not only on shared tones. Computed options appear in the "Substitutions" block and should be checked in context.

F 9#11

Octaves

Musical context

ChordF majorTriad

ChordF9#11F 9#11

ArpeggioF majorBroken triad

ScaleF major7 notes

KeyF majorMajor key

ProgressionPop axisSequence

How the chord relates to the scale, mode, key and progression.

Theory

General info

Full name: F 9#11
Symbol: F9#11
Root: F
Quality: 9#11

Chord notes

1Froot

3Amajor 3rd

5Cperfect 5th

b7Ebminor 7th

2Gmajor 2nd

#4Baug 4th

Functions & resolutions

Stability / tension: High tension — requires resolution
Most common resolutions: BbBb Major GmG Minor
Unstable degrees: 3A
4Bb
resolves up to the resolution tonic
6D
b7Eb
resolves down to the tonic 3rd
#4B
5C
resolves up to the 5th
Main resolution: F9#11source
BbBb Major
Dominant 7th F7 naturally resolves up a 4th to Bb. It is the tritone between the chord's 3rd and 7th that creates this pull.
Other resolutions: F9#11source
Deceptive resolution
GmG Minor
Instead of the tonic, the dominant resolves to the vi degree. Creates surprise and is often used to extend a musical phrase.
F9#11source
Modal resolution
EbEb Major
In rock and blues, the dominant often moves to bVII or IV instead of the tonic, creating a modal flavor.
F9#11source
Jazz reharmonization
B7B Dominant 7
Tritone substitution: F7 can be replaced by B7 (a tritone away). Both chords share the same tritone between the 3rd and 7th, resolving to the same tonic.
F9#11source
Functional resolution
Fsus4F Sus4
The dominant can resolve beyond the tonic: moving to IV (subdominant) or to a suspension (sus4) are common alternatives in pop and folk music.

Substitutions

Tritone substitution: B7B Dominant 7

Features

Character: Dominant, with 9th and augmented 11th
Characteristic interval: Augmented 11th (#11)
Description: The augmented 11th forms a tritone with the root and avoids the close clash that a perfect 11th creates with the 3rd. The combination of major 3rd, minor 7th, and #11 matches the Lydian dominant scale.
Application: Lydian harmony
Jazz and fusion
Film scoring

Voicing & structure

Root position

v1F(F4)Bass

root

v2A(A4)M3from F

v3C(C5)m3from A

v4Eb(Eb5)m3from C

v5G(G5)M3from Eb

v6B(B5)M3from G

Harmony

Compatible scales

All chord tones are contained in these scales — use them for improvisation.

ScaleC Melodic minor ScaleC Neapolitan major ScaleD# Lydian augmented ScaleG Mixolydian ♭6 ScaleB Enigmatic scale ScaleB Altered (super Locrian)ScaleE Neapolitan minor ScaleC Bebop melodic minor ScaleC Chromatic scale ScaleD# Chromatic scale

This chord on guitar 🎸

See how F9#11 looks on guitar.

Explore

Circle of fifths

Highlighted major keys contain this chord among their diatonic harmonies.

Relative key: DmD minor
Dominant: CC major
Subdominant: BbBb major
Key signature: 1 flat (Bb)

What to learn next

ScaleF Chromatic scaleScale to improvise over this chord PracticeChord trainerLock the fingering into muscle memory ProgressionChord progressionsHow this chord works inside real progressions

Recommended for you

F Chromatic scaleA scale related to this chord

Practice

Keyboard Trainer

Reinforce it in practice — play and name notes on the interactive keyboard.

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Test yourself

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What notes are in the F9#11 chord?

How do I build F9#11 on the keyboard?

Which keys is F9#11 found in?

What can I substitute for F9#11?