$14.99 Permutation of Tertial Triad and Tetrad Harmony quantity Add to cart Category: Instrumentalists Description Description Digital Downloads are Non-Refundable Related products Pitch Class Set Improvisation Études Course Bundle $49.99 Add to cart Applying Pitch Class Set Series Course Bundle $49.99 Add to cart Single String Studies for Guitar Volume One $11.99 Add to cart Doing Time with the Blues Volume Two $9.99 Add to cart