C#sus4(b9) Suspended
The C#sus4(b9) chord is built from the notes C# – F# – G# – D.
Piano sound loads on first tap.
Also known as
C#sus4b9
Chord tones, one by one
C#Root
Root
The fundamental note the chord is built on — C#.
F#Third
Suspended 4th
A perfect 4th replaces the third — tense, wants to resolve (sus4).
G#Fifth
Perfect fifth
Seven semitones — the most stable interval, reinforces the root.
DExtension
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