Thanks for the reminder. I need to get back to my challenge book.
"The Eternal Golden Braid". This not my description, but it sums it up.

This is a Pulitzer Prize winning book by Douglas Hofstadter. Nominally, it is about artificial intelligence. In practice, it is also about number theory in mathematics, computer science, cognitive science, art, recursion, the mind-body problem, logic, biology, philosophy, physics, literature, psychology, consciousness, and I am definitely leaving out stuff.

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"What you hear in a great jazz band is the sound of democracy. “The jazz band works best when participation is shaped by intelligent communication.”
Harmony happens whenever different parts get to form a whole by means of congruity, concord, symetry, consistency, conformity, correspondence, agreement, accord, unity, consonance…….