Reply #9: That's A Wierd Designation!

[ProfessorGAC]

Normally, i would expect to see 13/9 not 6/9. (Remember that the only real difference, in chord theory, between a 13th and 6th is the presence of the 7th, so the 6 is added "on top" of the 7th.)

However, the normal 6th chord has no dominant 7th, while both the 9th and 13th do. So, perhaps the point is to play the 6th chord with the added 9th without playing the dominant 7th. I'd call it a C6sus9. (Assuming key of C, for convenience.)

If i'm correct about this, the notes would be C, E, G, A, D. Probably set up as a four tone chord, leaving out the fifth, (G). Or the tonic, the major 3rd, the 6th and the 9th.

Yeah, i'd call that a 6sus9 chord.
The Professor