Peter O'Hagan has given performances of various unpublished piano works by Boulez, including Antiphonie from the Third Sonata and Trois Psalmodies. In this study, he considers Boulez's writing for the piano in the context of the composer's stylistic evolution throughout the course of his development. Each of the principal works is considered in detail, not only on its own terms, but also as a stage in Boulez's ongoing quest to invent radical solutions to the renewal of musical language and to reinvigorate tradition. The volume includes reference to hitherto unpublished source material, which sheds light on his working methods and on the interrelationship between works.