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F Dominant 7th Sharp 11

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F7♯11
F – A – B – C – E♭
Formula:R-M3-A4-P5-m7
Intervals:P1-M3-A4-P5-m7
Scale Degrees:1-3-#4-5-b7

Introduction

F Dominant 7th Sharp 11 piano chord, root position — F, A, C, Eb, B
The F Dominant 7th Sharp 11 chord in root position on a piano keyboard, notes F, A, C, Eb, B.

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.

Notes

Notes:F – A – B – C – E♭

Key Signature

The key of F Dominant 7th Sharp 11 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.

BEADGCF

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
IF Major (major)
DegreeNumeralChordQuality
1IF MajorMajor
2iiG MinorMinor
3iiiA MinorMinor
4IVA♯ MajorMajor
5VC MajorMajor
6viD MinorMinor
7vii°E DiminishedDiminished

Theory: Intervals

Formula: R-M3-A4-P5-m7
Intervals: P1-M3-A4-P5-m7

The F Dominant 7th Sharp 11 is built by stacking intervals from the root note. The formula R-M3-A4-P5-m7 describes the scale degrees used. The intervals P1-M3-A4-P5-m7 show the distance between each note in the chord.

F Dominant 7th Sharp 11 — Frequently Asked Questions

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.

Practice Tips

  • Play F7 then add B — Lydian Dominant brightness.
  • F7#11 as the IV7 in C Major is a classic jazz sound.
  • The #11 (B) doesn't clash with the third (A).
  • Lydian Dominant scale: F–G–A–B–C–D–Eb.
  • Tritone sub for B7.
  • Practice F7#11 → Bb resolution.

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