C Dominant 13th Sharp 9
C13#9 · Piano chord
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C – E – G – Bb – D# – A
1 – 3 – 5 – b7 – #9 – 13
This dominant thirteenth combines a sharp ninth with the natural thirteenth.
The C13#9 chord sounds distinctive, with a dominant 13th sharp 9 character. Its notes are C, E, G, Bb, D#, A.