Bb Dominant 13th Sharp 9
Bb13#9 · Piano chord
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Bb – D – F – Ab – C# – G
1 – 3 – 5 – b7 – #9 – 13
This dominant thirteenth combines a sharp ninth with the natural thirteenth.
The Bb13#9 chord sounds distinctive, with a dominant 13th sharp 9 character. Its notes are Bb, D, F, Ab, C#, G.