The circle of fifths is glorious, I say. Understanding it will help you be a better musician. It's why we do the scales in that same old order all the time, and it's what I'm talking about when I say the one, four, and five (it's actually the I, IV, and V, as you know). Patterns abound, and you will be amazed and delighted.

But get yourself a snack because this glorious video is about 20 minutes long.