On the guitar, most people know the basic major and minor chords. But what about the more exotic shapes like major 9, minor 11, flat 9, 13 chord, minor flat 6, etc. Where do these chords come from? The answer is the circle of thirds. The pattern that shows how to build and connect all of the chords in a key. You play C major, for example, by combining notes C, E, and G. And by adding more notes, you gradually extend the harmony. C major 7, C major 9, C major 11, C major 13. And starting on E, the E minor chord is made from notes E, G, B. Or extending it, you can play E minor 7, E minor flat 9, E minor 11, flat 9, E minor flat 13 flat 9. This is where fancy extended chords come from. And by going around the circle of thirds in any key, you can build all sorts of cool harmonies. For a PDF with thousands of these diagrams, see the link in my profile. Stay curious.
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