F♯ Dominant 7th Flat 9
F#7b9 · Root
Every chord tone stacked from the root up.
Click keys to experiment with the chord
F♯ – A♯ – C♯ – E – G
1 – 3 – 5 – b7 – b9
A flat ninth gives the dominant a strong pull, especially as V7 in a minor key, where Phrygian dominant or the altered scale are common choices. The half-whole diminished scale suits resolutions to major; b9 and the guide tones resolve into the following chord.
The F#7b9 chord sounds dark and dramatic, a staple of minor-key resolutions. Its notes are F#, A#, C#, E, G.