I have a question about this book. in the second section there are exercises on subdividing. the author says to play the exercises with the feel and subdivisions listed before them. the first two exercises are written as straight quarter notes and it says the feel is jazz and the subdivision is eighth note triplets. but the third exercise says to play with a rock feel and straight eighth note subdivision. but it is already written that way. if you subdivided the example more then it would become sixteenth notes. am i playing these exercises wrong? are they already subdivided when they are written out? if anyone else has this book could you please help me out? thank you.