A# 7 #9 chord — Open D
2 voicings · Open D
Tuning:DADF#AD
Fret 4 position
1 / 2
Chord tones
A#
R
D
+4
F
+7
G#
+10
C#
+3
A# 7 #9 in other tunings
7 #9 in other keys — Open D
A# 7 #9 in Open D — video lessons
About A# 7 #9 in Open D
The A# 7 #9 chord contains the notes A#, D, F, 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.