Musictheory - The Circle of Fifths

The circle of fifths is a way of organizing the 12chromatic pitches  as a sequence of perfect fifths. If C is chosen as a starting point, the sequence is: C, G, D, A, E, B (=C), F (=G), C (=D), A, E, B, F. Continuing the pattern from F returns the sequence to its starting point of C. This order places the most closely related key signature adjacent to one another. It is usually illustrated in the form of a circle.