Fr. Anthony Ruff, OSB, is a monk of St. John's Abbey. He teaches liturgy, liturgical music, and Gregorian chant at St. John's University School of Theology-Seminary. He is the founder of the National Catholic Youth choir. He is widely published and frequently presents across the country on liturgy and music. He is the author of Sacred Music and Liturgical Reform: Treasures and Transformations, and Responsorial Psalms for Weekday Mass: Advent, Christmas, Lent, Easter.