Table of Usual Root Progressions	Theory Things   William Wieland
adapted from Harmony by Walter Piston
FROM   OFTEN SOMETIMES LESS OFTEN I IV or V vi ii or iii ii V IV or vi I or iii iii vi IV I, ii or V IV V I or ii iii or vi V I IV or vi ii or iii vi ii or V iii or IV I vii°6 I or iii