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