A#7 / Bb7 Guitar Chord
A#7 (also written Bb7) is a dominant seventh chord. It adds a minor seventh to a major chord, which creates tension that wants to move on to the next chord. It is everywhere in blues. Its notes are Bb, D, F and Ab. Below are 2 ways to play it, each with a chord diagram, tab and finger numbers.
Notes in A#7 / Bb7
A#7 and Bb7 are two names for the same chord. The notes below are spelled as Bb7.
| Note | Degree | Interval |
|---|---|---|
| Bb | R | Root |
| D | 3 | Major 3rd |
| F | 5 | Perfect 5th |
| Ab | b7 | Minor 7th |
Formula: 1–3–5–b7
A#7 / Bb7 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.
A-shape 1fr
Easiest- Tab (6th → 1st string)
- x 1 3 1 3 1
- Fingers
- – 1 3 1 4 1
E-shape 6fr
- Tab (6th → 1st string)
- 6 8 6 7 6 6
- Fingers
- 1 3 1 2 1 1
How to play A#7 / Bb7 (easiest shape)
Shape: A-shape 1fr, tab x 1 3 1 3 1 (6th to 1st string).
- 1Lay your index finger (1) flat across the 5th to 1st strings at the 1st fret (a barre).
- 2Put your ring finger (3) on the 4th string at the 3rd fret.
- 3Put your pinky (4) on the 2nd string at the 3rd fret.
- 4Don't play the 6th string.
- 5Strum down from the 5th string to the 1st string.
A#7 / Bb7: common questions
- What notes are in the A#7 / Bb7 chord?
- A#7 and Bb7 are two names for the same chord. Spelled as Bb7, it has 4 notes: Bb, D, F and Ab. Counted from the root, that is 1–3–5–b7.
- Is there an easier way to play A#7 / Bb7?
- The easiest shape on this page is "A-shape 1fr" (x 1 3 1 3 1). 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
More guitar tools
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