Music Theory Lesson Four – The Circle of 4ths and 5ths

What is the circle of 4ths and 5ths?  This video breaks down this common circular diagram into an easy to understand chart that shows the order of keys along with their corresponding accidentals.  The 4ths ascend as flat keys and the 5ths ascend as sharps.  Also importantly discussed is how the reverse order of the circle of 4ths follows the exact same order as the ascending circle of 5ths.  There are multiple ways to think about the same thing.  Important things to remember include the semi-tone relationship of both intervals.  There are 5 half steps in a perfect 4th and 7 half steps in a perfect 5th. 

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