MCRS is the most comprehensive textbook in print (as of 2006) that teaches 16th century counterpoint in terms of species. (The Jeppesen counterpoint book also deals with species, but has only c.f. exercises, and is not organized in a student-friendly way.) Schubert's music examples are drawn primarily from Renaissance music treatises rather than repertoire, in order to illustrate the various species; the relatively small number of repertoire examples includes more French chansons than excerpts from Palestrina or Lassus. There are considerably more exercises and assignments--from preparatory "warmups" through analyses and error detections to c.f. fragments and complete cf's--than can be covered in a 15- week course. Canon and invertible counterpoint are recurring topics. My students found the organization of "hard" and "soft" rules helpful. The exercises can be time-consuming, so teachers considering adopting this book as a course text should allow ample time to go through it in advance to decide which exercises to use and to actually write out their solutions.