Bb Dominant 7th Sus4 Flat 9
Bb7sus4b9 · Piano chord
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Bb – Eb – F – Ab – Cb
1 – 4 – 5 – b7 – b9
A dominant sus chord with a flat 9th, also known as a Phrygian sus chord.
The Bb7sus4b9 chord sounds distinctive, with a dominant 7th sus4 flat 9 character. Its notes are Bb, Eb, F, Ab, Cb.