A# 9 b5 chord — Open D
1 voicing · Open D
Tuning:DADF#AD
Open position
1 / 1
Chord tones
A#
R
D
+4
E
+6
G#
+10
C
+2
A# 9 b5 in other tunings
9 b5 in other keys — Open D
A# 9 b5 in Open D — video lessons
About A# 9 b5 in Open D
The A# 9 b5 chord contains the notes A#, D, E, G#, C. 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.