A#7#9 / Bb7#9 Guitar Chord
A#7#9 (also written Bb7#9) is a dominant seventh sharp nine (7#9) chord. It is a dominant seventh with a sharp ninth on top. The sharp ninth rubs against the major third for the gritty sound heard in rock and funk. Its notes are Bb, D, F, Ab and C#. Below is one way to play it, with a chord diagram, tab and finger numbers.
Notes in A#7#9 / Bb7#9
A#7#9 and Bb7#9 are two names for the same chord. The notes below are spelled as Bb7#9.
| Note | Degree | Interval |
|---|---|---|
| Bb | R | Root |
| D | 3 | Major 3rd |
| F | 5 | Perfect 5th |
| Ab | b7 | Minor 7th |
| C# | #9 | Augmented 9th |
Formula: 1–3–5–b7–#9
A#7#9 / Bb7#9 chord shapes
Finger numbers: 1 index, 2 middle, 3 ring, 4 pinky. In the tab, x means don't play that string and 0 means play it open. In the diagrams the top line is the 1st (thinnest) string and the nut is on the left.
E-shape 6fr
Easiest- Tab (6th → 1st string)
- 6 8 6 7 6 9
- Fingers
- 1 3 1 2 1 4
How to play A#7#9 / Bb7#9 (easiest shape)
Shape: E-shape 6fr, tab 6 8 6 7 6 9 (6th to 1st string).
- 1Lay your index finger (1) flat across the 6th to 2nd strings at the 6th fret (a barre).
- 2Put your middle finger (2) on the 3rd string at the 7th fret.
- 3Put your ring finger (3) on the 5th string at the 8th fret.
- 4Put your pinky (4) on the 1st string at the 9th fret.
- 5Strum down from the 6th string to the 1st string.
A#7#9 / Bb7#9: common questions
- What notes are in the A#7#9 / Bb7#9 chord?
- A#7#9 and Bb7#9 are two names for the same chord. Spelled as Bb7#9, it has 5 notes: Bb, D, F, Ab and C#. Counted from the root, that is 1–3–5–b7–#9.
- Is there an easier way to play A#7#9 / Bb7#9?
- The easiest shape on this page is "E-shape 6fr" (6 8 6 7 6 9). Every shape on this page is a barre chord. Barre shapes are movable: keep the same hand shape and slide it along the neck to play this type of chord from other roots.
Related chords
Other A#/Bb chords
Same chord type, other roots
More guitar tools
See all 231 chords in the chord library, find a scale to play over them, or tune up before you start.