A7b9

— About this chord

A7b9 (1-3-5-b7-b9) is a tense, spicy altered dominant — the flattened 9th gives it a dark, dissonant bite that craves resolution. A go-to substitution for plain dominant chords in jazz and Latin turnarounds, especially resolving down a fifth or in minor-key ii-V-i cadences. Its symmetrical diminished-over-root shape makes it easy to slide chromatically. Also searched as Adom7b9, A7 flat 9, A7-9.