The short version
- B♭9 is B flat ninth, also written A♯9. Its notes are B♭, D, F, A♭ and C (formula 1 – 3 – 5 – ♭7 – 9).
- Easiest way to play it: a no-barre shape at the 1st fret, frets x 1 0 1 1 1 from low E to high E (x = don’t play).
- It sounds funky, bluesy and slick. Vamp on it with short, choppy strums for funk, or use it as a fancier V7 in blues and soul.
- B♭9 turns up in 2 keys: E♭ major (as the V9) and C minor (as the VII9).
- Try it in: B♭9 – E♭9 – B♭9 – E♭9, a two-chord funk vamp: short strums, lots of attitude.
How to play B♭9 on guitar, step by step
Start with the shape marked “Start here” above: the movable shape, root on the 5th string (1st fret).
- Put your index finger on fret 1 of the 5th (A) string.
- Put your middle finger on fret 1 of the 3rd (G) string.
- Put your ring finger on fret 1 of the 2nd (B) string.
- Put your little finger on fret 1 of the 1st (high E) string.
- Let the D string ring open.
- Don’t play the low E string: skip it, or touch it lightly with a spare finger so it can’t ring.
- Strum from the 5th (A) string down, then press Strum on this page to check it sounds the same.
Once that’s comfy, try the other shape. Shape 2 is the barre chord, root on the 6th string (6th fret): 6 8 6 7 6 8. Same chord, different spot on the neck, which helps when the next chord lives nearby.
Slide it around: this shape has no open strings and no barre, so the same fingering works on any fret. Move it up two frets and it becomes C9. One shape, twelve chords, zero extra homework.
Notes in the B♭9 chord
B♭9 is built from 5 notes. On guitar you’ll often play some of them twice, on different strings. That’s normal; the chord is still B♭9.
| Note | Interval | What it does |
|---|---|---|
| B♭ | 1 root | Names the chord and anchors the bass. |
| D | 3 major third | Makes it major (happy). |
| F | 5 perfect fifth | Adds weight; often the first note left out. |
| A♭ | ♭7 minor (flat) seventh | The bluesy pull towards the next chord. |
| C | 9 ninth | Sparkle on top. |
What B♭9 sounds like, and when to use it
A dominant seventh with the ninth stacked on top. Funky. James Brown’s guitarists basically lived on one of these for a decade. Vamp on it with short, choppy strums for funk, or use it as a fancier V7 in blues and soul.
What key is B♭9 in?
B♭9 turns up in 2 keys: E♭ major (as the V9) and C minor (as the VII9). Tap a key to see the rest of its chords on the circle of fifths.
| Key | Numeral | Spelled as |
|---|---|---|
| E♭ major | V9 | B♭9 |
| C minor | VII9 | B♭9 |
Chords that go with B♭9
Here’s a progression to try: B♭9 – E♭9 – B♭9 – E♭9 (I9–IV9), a two-chord funk vamp: short strums, lots of attitude.
More progressions → Transpose it →
Using B♭9 in a Suno prompt
Suno pays attention to chord names in a style prompt, at least some of the time. Put the progression in, keep the BPM, and let it fill in the rest. Then compare its guitar part with the shapes above.
Funk, 108 BPM, chord progression B♭9 – E♭9 – B♭9 – E♭9, choppy ninth-chord guitar stabs, slap bass, tight funky drums, horn hits, groovy and playful
B♭9 chord FAQ
What notes are in the Bb9 chord?
B♭9 has 5 notes: B♭ (the root), D (the major third), F (the perfect fifth), A♭ (the minor (flat) seventh) and C (the ninth). The chord formula is 1 – 3 – 5 – ♭7 – 9.
How do you play Bb9 on guitar?
The medium way is movable shape, root on the 5th string (1st fret). Strings from low E to high E: x 1 0 1 1 1 (x means don’t play that string). Put your index finger on fret 1 of the 5th (A) string. Put your middle finger on fret 1 of the 3rd (G) string. Put your ring finger on fret 1 of the 2nd (B) string. Put your little finger on fret 1 of the 1st (high E) string. Let the D string ring open. Don’t play the low E string: skip it, or touch it lightly with a spare finger so it can’t ring.
Is Bb9 the same as A#9?
Yes. B♭9 and A♯9 are the same chord with the same fingering. They are just spelled differently. You’ll see A♯9 in sharp keys and B♭9 in flat keys.
What key is Bb9 in?
B♭9 turns up in 2 keys: E♭ major (as the V9) and C minor (as the VII9). Major keys: E♭ major. Minor keys: C minor.
What is the difference between Bb9 and Bb7?
B♭9 is B♭7 with the ninth (C) on top. It sounds richer and funkier; B♭7 is the plainer, bluesier version.
What chords go well with Bb9?
Try E♭9, B♭7, E♭ and F9. The progression B♭9 – E♭9 – B♭9 – E♭9 (I9–IV9) is a two-chord funk vamp: short strums, lots of attitude. Press Play progression on this page to hear it.
Other dominant 9th chords
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