Wow, not sure the C9 was ever clarified? This tread really took off.

As a guitarist this is a very popular jazz chord and it is played as a dominate chord, R, 3, b7, 9. Like Mario said, for us guitar players we generally use only 3 note chords except when its Jazz and we use 4 note chords like C9 . grin



Otherwise, I would consider the voicing for Cadd9 or C2 to be ambiguous unless further clarified. On piano, I would likly play a C triad and add the D as the high note and then look around to see if I get any strange looks. crazy But thats just me.

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