Is this a Perfect 5th or a Perfect 4th?

The answer is Yes.

If either side of a Boolean expression 'or' is True, the whole expression is True. If both sides (understandable in this case) are True, the answer is still True.

But I like the way David thinks of it. What is the progression, and in what key? That's how you determine the useful answer.

And I like that the video recognizes that not everyone uses the circle of ____ the same way.



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