A9 chord on 4-String Bass – Low B
in Low B (B-E-A-D) tuning
A9
Dominant 9
Notes:A · C# · E · G · B
Piano Left hand Right hand
Fingerings (11)
A9 shapes as text
| Shape | Frets | Fingers | Notes | Difficulty |
|---|---|---|---|---|
| 0 3 4 7 | – 1 2 3 | B G C# A | hard | |
| 2 5 2 5 | 1 2 1 3 | C# A B G | medium · barre on fret 2 | |
| 0 5 4 5 | – 2 1 3 | B A C# G | easy | |
| 0 9 0 5 | – 2 – 1 | B C# A G | hard | |
| 10 7 10 11 | 2 1 3 4 | A B G C# | hard | |
| 8 9 0 9 | 1 2 – 3 | G C# A B | easy | |
| 10 9 10 9 | 2 1 3 1 | A C# G B | easy · barre on fret 9 | |
| 8 7 4 7 | 4 2 1 3 | G B C# A | hard | |
| 0 9 10 7 | – 2 3 1 | B C# G A | medium | |
| 8 9 12 9 | 1 2 4 3 | G C# A B | hard | |
| 8 7 0 11 | 2 1 – 3 | G B A C# | hard |
The A9 chord (Dominant 9) is built from the notes A, C#, E, G, B. Below are playable fingerings for 4-String Bass – Low B generated for your selected tuning, ordered from open-position shapes up the neck. Tap a diagram to hear it, or switch to the piano view to see the same harmony on keys.
How the A9 chord is built
Formula: 1 · 3 · 5 · ♭7 · 9
| Degree | Semitones | Note |
|---|---|---|
| 1 | 0 | A |
| 3 | 4 | C# |
| 5 | 7 | E |
| ♭7 | 10 | G |
| 9 | 14 | B |
More A chords
Other roots
See A9 in another tuning
What notes make up the A9 chord?
A9 is a Dominant 9 chord built from the notes A, C#, E, G, B.
How do I read the diagram?
Strings run left to right from the lowest to the first string; the numbers show which finger presses each fret. An ○ marks an open string, an ✕ marks a muted one.