He also wrote and produced his own instructional DVDs , Rhythmic Visions and Rhythmic Horizons , at his home studio .
Harrison has authored two instructional drum books entitled Rhythmic Illusions and Rhythmic Perspectives .
Harrison also wrote and produced Harrison 's own instructional DVDs , Rhythmic Visions and Rhythmic Horizons , at his home studio .
Harrison has authored two instructional drum books entitled Rhythmic Illusions and Rhythmic Perspectives .