Thanks for the clarifications. Yes, I was aware that tritone and secondary dominants are not part of borrowing from the parallel minor keys, sorry for any confusion.
It seems that these three methods of (borrowing from parallel key, secondary dominants and tritone subs) are pretty much the majority of non diatonic chord subs to a progression in all genres. Is that statement true or are there other such standard used devices I am unaware of?
TIA
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This reply was modified 2 years, 9 months ago by R T.