Outstanding video. Thanks for posting. I love the way they illustrated with four bar examples. That's an education in itself.

I watch most stuff by the young fellow. I'm not sure the world needed another on this topic though.
I have learnt another seven to avoid though.

It is quite amazing how much mileage songwriters have gotten from the I V vi IV progression. so many different songs and styles of songs.

I'd like to see him take it a little further and show how the lines of the 12 bar format relate to each other.