Yeah, I was told it was the key that would unlock the door to everything. I actually started a thread a while ago asking what the point of it was, and as I recall I didn't get a solid answer 😄
Appreciate it's only one aspect, though.
I tried learning the circle of fifths once, as recommended by a learned friend. Gave up after a while 'cos I wasn't quite sure what the point of it was.
Different strokes, and all that.
I'm not sure I buy their 'not running at a profit' official line. I'm confident there's some creative accounting going on, even if it's not in the billions.