The central theme of this book is the relationship between the reflections about and the realization of a musical composition. In his essay "Words about Music, or Analysis versus Performance," Nicholas Cook states that words and music can never be aligned exactly with one another. He embarks on a quest for models of the relationship between analytical conception and performance that are more challenging than those in general currency. Peter Johnson's essay, "Performance and the Listening Experience: Bach's 'Erbarme dich'" shows that a performance is an element within the intentionality of the work itself. He looks for scientific methods capable of proving the artisticity of a performance. And the composer Hans Zender, in his "A Road Map for Orpheus?," states that a composer must be capable of questioning obvious basic principles (such as equal temperament) and finding creative solutions.