F Dominant 9th Flat 5
F9b5 · Piano chord
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F – A – Cb – Eb – G
1 – 3 – b5 – b7 – 9
The lowered fifth gives the dominant ninth a tense, altered color. It can resolve as a dominant chord, with the third and flat seventh guiding the voice leading.
The F9b5 chord sounds distinctive, with a dominant 9th flat 5 character. Its notes are F, A, Cb, Eb, G.