Dominant 7th ♭5 ♯9 Chords on Piano

The dominant 7th ♭5 ♯9 combines the tritone-substitute quality of the ♭5 with the blues-rock bite of the ♯9. It is closely related to the altered scale and functions as a compact altered dominant voicing — four notes that capture the essence of the full altered sound. Common in jazz comping and solo piano arrangements.

Formula: Root – Major 3rd – Diminished 5th – Minor 7th – Augmented 9th

Scale degrees: 1–3–♭5–♭7–♯9

Sound: Altered, compact, blues-jazz, tritone

Symbol: 7♭5♯9 (C7♭5♯9)