"Paulo C. Chagas is one of those remarkable composers well versed not only in the methods and means of musical creation but also in theoretical issues of aesthetics, semiotics, mathematics, and philology. This book displays an exceptional grasp of a wide range of complex theoretical and philosophical issues, all of them nonetheless directly connected to the act of composing music. Indeed, it is precisely because of his passionate intellectual engagement that Chagas's music always exhibits emotional immediacy as well as technical sophistication. Both his works and his ideas draw their inspiration from the wellspring of daily life and its frequently harsh realities."-Walter Clark, University of California, Riverside