Welcome To The New Age: It's Interactive, It's Interactive!
Love me some Imagine Dragons.
So, I found this tool a long time ago, but it's been updated to HTML5 and is even groovier than before. Basically, the Circle of Fifths is a fantastic tool for understanding more about music theory. This mysterious piece o' pie contains solutions to many of the mysteries that lie within the mathematics of music (and, face it, music is a lot of math. I always sucked at math, so any aid helps.)
I'll get more into the Circle of Fifths in a later post, but right now, this page is all you need to get started exploring it, if you're not already somewhat familiar with its usage. Just another nugget in a deep-fried basket of musical fun.