Listen as Kraus discusses more music theory and how knowing the formulas will help you compose and learn your favorite songs!  The genre of 50's American pop rock is discussed and how the addition of the fourth chord makes this just different enough than other genres to warrant a discussion,  but not so different that it is no longer used as a formula.  If you would like to learn to play your favorite songs check out World's Best Piano Lessons!  Piano lessons in your home on your time!