Hi Tony,

It is indeed good news that you are healing. I know you will be back on your feet soon and enjoying life as much as ever - especially your music. Its good to see you participating here.

Tony, to be honest, I have never heard the term "polyphonic" applied to a chord type, but having said that, chords are indeed multi-phonic (or polyphonic) since they consist of multiple notes, each with a different sonority. The chord you mentioned - C,E,G,B,D,F#,A - can be looked at from two perspectives. First, as a Cmajor7 chord with a 9th, augmented 11th, and 13th added. Second, as a chord with bi-tonality i.e., C,E,G (C major) with Bminor7 on top - B,D,F#,A. I have never attempted to make an in-depth study of harmony for it is not something I want to pursue in my music. On the other hand, I have picked up a little knowledge over the past 66 years of playing an instrument and my basic understanding of what makes music tick harmonically speaking has come in handy from time to time. I've enjoyed this discussion of chords for it made me do some serious thinking and reading, and recalling from experience. Perhaps we can carry the theme of this thread forward with folks offering nice chords for intros and endings - chords such as you and KFingers have shared.

Take care, Tony.

Best Regards, Chuck