Circle of fifths

The circle (or cycle) of fifths is often shown as a diagram showing how the key signatures are all linked, with major keys in red in the diagram below and minor keys in green. It is named the circle of fifths as the keys are a fifth away from each other as you go around the circle clockwise. So C to G is a perfect fifth, G to D is a perfect fifth and so on.

You can see the major keys on the outside in red, and their relative minors in green on the inside of the circle.

Image by Just plain Bill (Own work) [GFDL (http://www.gnu.org/copyleft/fdl.html) or CC-BY-SA-3.0 (http://creativecommons.org/licenses/by-sa/3.0/)%5D, via Wikimedia Commons

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