The F♯ 9sus4 chord is a five-note chord made up of F♯, B, C♯, E, and G♯. It is built from a root, perfect fourth, perfect fifth, minor seventh, and major ninth.
Construction
F♯ 9sus4 = Root + Perfect 4th + Perfect 5th + Minor 7th + Major 2nd = F♯ · B · C♯ · E · G♯
| Note | Interval | Degree |
|---|---|---|
| F♯ | Root | 1 |
| B | Perfect 4th | 11 |
| C♯ | Perfect 5th | 5 |
| E | Minor 7th | ♭7 |
| G♯ | Major 2nd | 9 |
Key Signature
A chord has no key signature of its own, but the F♯ 9sus4 is the tonic (I) chord of F# Major, whose key signature has 6 sharps (F♯, C♯, G♯, D♯, A♯, E♯).
F♯C♯G♯D♯A♯E♯
Order of sharps
Sharps are added to a key signature in a fixed order. Each new sharp key adds the next sharp on the list.
F♯C♯G♯D♯A♯E♯B♯
Mnemonic: Father Charles Goes Down And Ends Battle
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♯ – B – C♯ – E – G♯ aren’t exclusive to this chord. Depending on which note is the bass and how the chord functions, the same pitches also spell:
F♯ 9sus4 — Frequently Asked Questions
What is the F♯ 9sus4 chord on piano?
The F♯ 9sus4 chord contains the notes F♯ – B – C♯ – E – G♯. On piano, play these notes together to sound the chord.
What notes are in the F# 9sus4 chord?
The F# 9sus4 chord (F#9sus4) contains 5 notes: F#, B, C#, E, G#. Formula: R-P4-P5-m7-M9.
How is F#9sus4 used in music?
F#9sus4 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 F#9sus4?
F#9sus4 uses scale degrees 1-4-5-b7-9, giving it its distinctive sound.