Circle of Fifths
Find all the chords, or a progression in a key. The yellow ring is the major key, green ring is the minor key. Example: With the C centered on the bottom of the ring read the chords above the I,vi,IV,V. (1,6,4,5 progression) For the Key of C the chords are C, A minor, F, G. For the key of D the chords are D, Bm, G, A.