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This is good stuff. Thank you. Unlike many on this forum, I have not had a lot of formal music education. Most of what I know, I learned by ear. Well, posts like this are real gems to me, because it brings things to light, that many may know, but few share. Much food for thought. Like one line from part three, "The fact is you can have a big bad ass chord progression with zero harmonic movement, you’re just fiddling with voicings (again, I’m assuming you read Part 2). It’s amazing how easily you can spend half a lifetime in voicings and miss the big harmonic picture." It reminds me of the time Mac sent me two chord turnarounds that I was looking for, with two different harmonic movements, that really made one of my songs come alive.
I have really learned so much from this forum, I can't even thank everyone enough. I print everything important, so I have my own reference book now.

Ok, well I'm off to part 4. Thank you

Gene