Your last point about the sounds was just addressed in your other thread, by someone from PG Music.

What I’m saying here is that music has no ‘correct’. It has creativity and sometimes beauty, or not. These charts only give you suggestions of chord progressions that should work. That does not mean this will be good music. Sometimes you need to break the rules and just ask yourself, does it sound good?

And about those rules, are you familiar with a parallel minor scale (starts on the same note as its major scale but with a different key signature). It’s not a relative minor scale. And there are others. This is all music theory. Learn it, then consider if you always want to follow it.

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