Bb13(#9) chord - Bb Dominant Thirteen Sharp Ninth - guitar chord chart
Built on Bb, the Bb13(#9) chord (Bb thirteenth sharp nine) combines a root, a major third, a perfect fifth, a minor seventh, a sharp ninth, an eleventh and a thirteenth, which gives Bb, D, F, Ab, C#, Eb and G.
The C# is the sharp ninth, a raised C. It sounds like Db, a minor third above the root. Over the chord you can use the Bb Half-Whole scale, built from alternating half and whole steps, which holds every chord tone except the eleventh.
The major third D and the minor seventh Ab form the tritone that gives the chord its dominant pull toward the chord a fourth above Bb.
Bb 13th with sharp 9th guitar chord is also written as Bb13(#9), Bb13#9 or Bb13+9.
Notes that compose the Bb 13(#9) chord:
How to create the Dominant Thirteen Sharp Ninth chord:
Formula: 1 3 5 b7 #9 11 13
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Giancarlo is a musician (teaching guitar since 2000), software engineer, AI consultant and published researcher
FAQ
What are the notes of Bb13(#9)?
Bb13(#9) is spelled Bb, D, F, Ab, C#, Eb and G. It stacks a major third, perfect fifth, minor seventh, sharp ninth, eleventh and thirteenth over Bb.
Are Bb13(#9) and A#13(#9) the same chord?
Yes, they share every pitch. A#13(#9) spells them A#, C##, E#, G#, B##, D# and F##, so Bb13(#9) is the cleaner name.
Why does Bb13(#9) contain both D and C#?
D is the major third and C# is the sharp ninth. They sit a half step apart in sound, and that mix of major and minor flavor defines the chord.
Which scale suits Bb13(#9)?
The Bb half-whole scale spells Bb, Cb, C#, D, E, F, G and Ab. It covers every chord tone except the eleventh, Eb.
