Perhaps one of the most useful tools for any aspiring theory student is the Circle of Fifths. This clock-shaped theoretical tool details the ins and outs of various key signatures and how they relate of each other. A basic understanding of major and minor tonalities is required to fully comprehend this lesson, so brush up on your basic theory before taking this one on!
Explanation of key signatures and how to memorize them and their “relatives”.
Common uses for the circle of fifths, including bass lines and chord progressions
The use of closely related keys as a way of “borrowing” chords temporarily