67.29Level 13 — upper chord fixed, bass moves

Hold RH:

C-E-G.

Move bass:

C

A

F

D.

Interpretations:

C/C = C.

C/A = Am7-ish color without 5? A-C-E-G = Am7.

C/F = Fmaj9-ish depending context.

C/D = D11/sus-ish.

Same RH triad.

Different harmony entirely.