221 Rotation Plate “221 Rotation Plate” has been added to your cart. View Cart Look inside Details Add To Cart Preview Buy (A$2.90) 221 Rotation Plate Rotation Plate for Altered Scale 221 as found in our eBooks. The COMK Cycle of Movable Keys for music improvisation and composition. 1 pages Post navigationPrevious post: 220 Rotation PlateNext post: 222 Rotation Plate