F#sus4(b9) Suspended
The F#sus4(b9) chord is built from the notes F# – B – C# – G.
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Also known as
F#sus4b9
Chord tones, one by one
F#Root
Root
The fundamental note the chord is built on — F#.
BThird
Suspended 4th
A perfect 4th replaces the third — tense, wants to resolve (sus4).
C#Fifth
Perfect fifth
Seven semitones — the most stable interval, reinforces the root.
GExtension
Flat ninth (♭9)
A ♭9 — sharp, dissonant tension typical of altered dominant chords.
🎼 Related scales
🎹 Modal analysis
This chord implies the Phrygian scale; its characteristic note is the ♭9 / ♭2.
🎸 Genres
Flamenco · Metal · Modal jazz