Think Purple Rain Bbadd9 x13531. I love the sound of them, but they can be quite awkward to play in closed positions because they contain the first three notes of the major scale = a pair of 2nd intervals, which is difficult to arrange across strings tuned in 4ths.
Formula is 1 3 5 9 so a Cadd9 would be C E G D.
Here are the 5 CAGED shapes with add9 chords constructed around them:
C shape - Dbadd9: x43141
A shape - Bbadd9: x13531
G shape - Abadd9: 4x1314
E shape - Fadd9: 135211
D shape - Ebadd9: xx1363 (not really playable - in practice I'd play a C-shape x65363 instead)
What moveable add9 chords can you come up with?
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