The Musicians Guide To Polyrhythms is a study guide by American author, drummer and percussionist Peter Magadini. Musicians Guide to Polyrhythms Vol. I was written in 1967 and published in 1968. Musicians Guide to Polyrhythms Vol. II was written in 1970 and published in 1971 and was (at the time) a continuation of Vol. l. The first publisher (Try Publishing, Hollywood, Ca.) published both volumes separately.