Book Four covers more advanced exercise building on previous concepts, including: all sticking philosphies including categories 1-6 applied to various time signatures and groupings; the remaining advanced rudiments and etudes; Ralph's (and Mike Packer's)Rudimental Challenges; advanced ostinatos and hand phrases; right-hand lead patterns; note groupings; hand ostinatos; rhythmic coordination; and quintuplets and septuplets. - the publisher