It is perhaps a little-known fact that Marv Dahlgren and Elliot Fine intended to write a second book of 4-Way Coordination as a continuation of the ideas presented in the final two pages of the first book (titled “Advanced Polyrhythmics”). Although the second volume never appeared, Marv did write a 16-page set of exercises on his own, exploring these concepts. The article is available for $10 (hard copy or pdf download) at Really Good Music, LLC
(If you give the exercises a try, we would love to hear your feedback in the comments section below!)
Marv Dahlgren's Legacy 