B13(b9) Guitar Chord Chart and Fingering

B thirteenth flat nine is the full name of B13(b9), a chord of seven notes: B, D#, F#, A, C, E and G#.

Each note sits a third above the one before it by letter name, so the stack runs root, third, fifth, seventh, ninth, eleventh and thirteenth. The flat ninth C is a half step above the root. Every tone except the eleventh sits inside the B Half-Whole scale, the eight-note scale of alternating half and whole steps.

On a chart it may be written B13b9, and it means the same chord.

B 13th with flat 9th guitar chord is also written as B13(b9), B13b9 or B13-9.

B13(b9) Chord Notes and Formula

Notes that compose the B 13(b9) chord:

B D# F# A C E G#

Tones in the Dominant Thirteen Flat Nine chord:

Formula: 1 3 5 b7 b9 11 13

B13(b9) Chord Interactive Fretboard

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Chords That Go With B13(b9)

One key where B13(b9) fits is E major, where it works as the V chord, an altered chord whose C is borrowed from outside the key. These are the main chords of that key, the ones you will often hear around it:

I · E ii · F#m iii · G#m IV · A V · B vi · C#m

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

More B Chords

B Bm B7 Bm7 Bmaj7 Bsus4 Bsus2 Badd9 Bdim B9 B13(#11) B13#5 B13(#9) B6/9

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

Play This Chord With Other Roots

C 13(b9) | D 13(b9) | E 13(b9) | F 13(b9) | G 13(b9) | A 13(b9) | B 13(b9) | C#13(b9) | D#13(b9) | F#13(b9) | G#13(b9) | A#13(b9) | Ab13(b9) | Bb13(b9) | Db13(b9) | Eb13(b9) | Gb13(b9)

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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 notes spell B13(b9)?

B13(b9) is B, D#, F#, A, C, E and G#. These are the root, major third, perfect fifth, minor seventh, flat ninth, eleventh and thirteenth.

How is B13(b9) different from B13?

B13 has a natural ninth, C#. In B13(b9) that note drops a half step to C, which sits right next to the root and adds tension.

What scale can I play over B13(b9)?

The B half-whole scale contains every chord tone except the eleventh, E. It includes the flat ninth C and the thirteenth G#.

What intervals are in B13(b9)?

From B the chord stacks a major third, D#, a perfect fifth, F#, a minor seventh, A, and a flat ninth, C. It then adds the eleventh, E, and the thirteenth, G#.