The F 7♭9♯11 chord is a six-note chord made up of F, A, C, E♭, G♭, and B. It is built from a root, major third, perfect fifth, minor seventh, minor ninth, and augmented eleventh.
Construction
F 7♭9♯11 = Root + Major 3rd + Perfect 5th + Minor 7th + Minor 2nd + Diminished 5th = F · A · C · E♭ · G♭ · B
| Note | Interval | Degree |
|---|---|---|
| F | Root | 1 |
| A | Major 3rd | 3 |
| C | Perfect 5th | 5 |
| E♭ | Minor 7th | ♭7 |
| G♭ | Minor 2nd | ♭9 |
| B | Diminished 5th | ♭5 |
Key Signature
A chord has no key signature of its own, but the F 7♭9♯11 is the tonic (I) chord of F Major, whose key signature has 1 flat (B♭).
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 triads built on each degree of the F major scale:
Same Notes, Other Names
The notes F – A – C – E♭ – G♭ – B aren’t exclusive to this chord. Depending on which note is the bass and how the chord functions, the same pitches also spell:
F 7♭9♯11 — Frequently Asked Questions
What is the F 7♭9♯11 chord on piano?
The F 7♭9♯11 chord contains the notes F – A – C – E♭ – G♭ – B. On piano, play these notes together to sound the chord.
What notes are in the F 7♭9♯11 chord?
The F 7♭9♯11 chord (F7♭9♯11) contains 6 notes: F, A, C, Eb, Gb, B. Formula: R-M3-P5-m7-m9-A11.
How is F7♭9♯11 used in music?
F7♭9♯11 is used in jazz, fusion, and contemporary music to add harmonic color. It appears as a dominant or tonic chord depending on context.
What is the scale degree formula for F7♭9♯11?
F7♭9♯11 uses scale degrees 1-3-5-b7-b9-#11, giving it its distinctive sound.