A 7 b9 chord — Open D
1 voicing · Open D
Tuning:DADF#AD
Fret 7 position
1 / 1
Chord tones
A
R
C#
+4
E
+7
G
+10
A#
+1
A 7 b9 in other tunings
7 b9 in other keys — Open D
A 7 b9 in Open D — video lessons
About A 7 b9 in Open D
The A 7 b9 chord contains the notes A, C#, E, G, A#. In Open D tuning (strings: D–A–D–F#–A–D), the chord shapes differ from standard tuning because the open string pitches change. Open D tuning gives an open D major chord across all strings — ideal for slide guitar and Joni Mitchell-style playing. Diagrams above show all playable shapes in this tuning.