This is a very useful tool for understanding how chords and keys relate to each other. This is just an introduction to how it is build, and the major and minor scale degrees that correspond to the circle.
Year 2 UNIT 7- PDF E-book (Chords 2)
In the next lesson we will be practicing all of the major and minor triads contained within the circle.
In order to move on to playing more complex chord types, it is essential to know and understand major and minor triads.