The F Dominant 7th Sharp 11 chord is a five-note chord made up of F, A, B, C, and E♭. It is built from a root, major third, augmented fourth, perfect fifth, and minor seventh.
Construction
F Dominant 7th Sharp 11 = Root + Major 3rd + Diminished 5th + Perfect 5th + Minor 7th = F · A · B · C · E♭
| Note | Interval | Degree |
|---|---|---|
| F | Root | 1 |
| A | Major 3rd | 3 |
| B | Diminished 5th | ♭5 |
| C | Perfect 5th | 5 |
| E♭ | Minor 7th | ♭7 |
Key Signature
A dominant chord points home to the key a fifth below its root: the F Dominant 7th Sharp 11 is the V (dominant) of A# Major, so the relevant key signature is that key’s — 2 flats (B♭, E♭). Spelled as a scale, these notes are F Mixolydian.
B♭E♭
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 A♯ Major
These are the triads built on each degree of the A♯ major scale:
F Dominant 7th Sharp 11 — Frequently Asked Questions
What is the F Dominant 7th Sharp 11 chord on piano?
The F Dominant 7th Sharp 11 chord contains the notes F – A – B – C – E♭. On piano, play these notes together to sound the chord.
What notes are in the F Dominant 7th Sharp 11 chord?
F7#11 contains: F, A, B, C, Eb. Lydian Dominant sound.
How does F7#11 differ from F7?
Adds B (the #11). Brighter and more complex.
How does F7#11 differ from F11?
F11 has Bb (clashes with A). F7#11 has B which doesn't clash.
How is F7#11 used in music?
Lydian Dominant. Jazz. Tritone sub for B7. Common as the IV7#11 in C Major.
What scale matches F7#11?
F Lydian Dominant: F, G, A, B, C, D, Eb — 4th mode of C melodic minor.
What songs use 7#11?
Modern jazz. F7#11 as IV7 in C is a classic jazz colour.