F#dim7(b9) Diminished
The F#dim7(b9) chord is built from the notes F# – A – C – Eb – G.
Piano sound loads on first tap.
Also known as
F#dim7addb9F#o(addb9)F#o7(addb5b9)F#o7(b9)
Chord tones, one by one
F#Root
Root
The fundamental note the chord is built on — F#.
AThird
Minor third
Three semitones — makes the chord minor (darker, sadder).
CFifth
Diminished fifth (♭5)
Six semitones — a flat fifth. Creates instability, typical of m7♭5 and diminished chords.
EbSeventh
Diminished seventh (♭♭7)
Nine semitones — a doubly-flat seventh, found in fully diminished 7th chords.
GExtension
Flat ninth (♭9)
A ♭9 — sharp, dissonant tension typical of altered dominant chords.
🎼 Related scales
Locrian ♮6harmonic minor a semitone below
🎹 Modal analysis
This chord implies the Locrian ♮6 scale; its characteristic note is the natural 6th over a diminished chord. It is a mode of the harmonic minor a semitone below.
🎸 Genres
Modern jazz · Post-bop · Fusion