Having had two semesters of (less than illuminating) Music Theory classes and after playing guitar for scores of years, I have stumbled upon this enlightening and relatively easy to digest explanation of the Circle of Fifths. It now begins to make sense to me – especially the mathematical background of it. It occurs to me that maybe others here might appreciate a better understanding of it. Please excuse me if this has been posted before: https://youtu.be/_UxzDjU3-hM