The circle of 5ths (an interval encompassing five notes) is a helpful tool in classical guitar for viewing the 12 major and minor keys by the order of sharps and flats in their key signatures. The key of C (no sharps or flats) is at the top, or 12 o’clock position. Moving clockwise from C you progress, by ascending 5ths, through all 12 keys beginning with sharps.

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