The circle of fifths is a tool used in music theory to show the relationship between the 12 pitches in Western music. It is represented as a circle, with each pitch arranged in a clockwise progression of ascending fifths.

Starting from the top of the circle with the key of C, each successive key is a fifth higher than the previous one, moving clockwise around the circle. So, starting with C, the next key is G, then D, A, E, B, F#, Db, Ab, Eb, Bb, and finally back to C.

In addition to showing the progression of keys, the circle of fifths can also be used to demonstrate the relationship between major and minor keys. Each major key on the circle is paired with its relative minor key, which is located three positions counter-clockwise.

The circle of fifths is a useful tool for understanding music theory and for composing and arranging music. It can help with key selection, chord progressions, and modulations.
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