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.

Bb13(#9) Chord Notes and Formula

Notes that compose the Bb 13(#9) chord:

Bb D F Ab C# Eb G

How to create the Dominant Thirteen Sharp Ninth chord:

Formula: 1 3 5 b7 #9 11 13

Same chord, different name: Bb13(#9) is also written as A#13(#9) (A# thirteenth sharp nine).

Bb 13(#9) Chord Interactive Fretboard

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Chords That Go With Bb13(#9)

One key where Bb13(#9) fits is Eb major, where it works as the V chord. These are the main chords of that key, the ones you will often hear around it:

I · Eb ii · Fm iii · Gm IV · Ab V · Bb vi · Cm

See every key in the guitar keys chart, or build a progression with these chords in the chord progression generator.

More Bb Chords

Bb Bbm Bb7 Bbm7 Bbmaj7 Bbsus4 Bbsus2 Bbadd9 Bbdim Bb9 Bb6/9 Bb6(#11) Bb7(b13) Bb7(b9)

Want to know how this chord is built? Read dominant chords explained, or browse all Bb guitar chords.

Play This Chord With Other Roots

C 13(#9) | D 13(#9) | E 13(#9) | F 13(#9) | G 13(#9) | A 13(#9) | B 13(#9) | C#13(#9) | D#13(#9) | F#13(#9) | G#13(#9) | A#13(#9) | Ab13(#9) | Bb13(#9) | Db13(#9) | Eb13(#9) | Gb13(#9)

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Created by

Giancarlo Facoetti

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.