Use Cursor to Select a key
This Chord Progression Map guides you through scores of possible chord progressions that you can use as the harmonic basis of your own songs.
This diagram shows you chords grouped according to their function and shows you links from one group to another according to standard Diatonic harmonic rules.
Use the "key pad" at the top of the diagram to select the key in which you want to write your song. Beginning on the block in the upper left (I), chose a chord within that block.
Next move to any other block to begin your progression. Use the arrows to guide you to your next "harmonically friendly" chord. When you end up on the block on the far right (I), you have completed your progression.
Different chord functions are indicated by the Roman numerals of each block.
Visit this link for more information about chord progressions.