Anthony Ruff, O.S.B., has written a brilliant, comprehensive, well-researched book about the treasures of the Church's musical tradition, and about the transformations brought about by liturgical reform. The liturgy constitution Sacrosanctum Concilium stated many revolutionary principles of liturgical reform. Regarding liturgical music, the Council's decrees mandated, on the one hand, the preservation of the inherited treasury of sacred music, and on the other hand, advocated adaptation and expansion of this treasury to meet the changed requirements of the reformed liturgy. In clear, precise language, he retrieves the Council's neglected teachings on the preservation of the inherited music treasury. He clearly shows that this task is not at odds with good pastoral practice, but is rather an integral part of it. The book proposes an alternate hermeneutic for understanding the Second Vatican Council's teachings on worship music.