This work aims to show how music can enrich and advance theology, extending our wisdom about God and God's ways with the world. Instead of asking what theology can do for music, it asks what music can do for theology. The author argues that music's engagement with time gives the theologian invaluable resources for understanding how it is that God enables us to live peaceably with time as a dimension of the created world. Without assuming any specialist knowledge of music, he exploresa wide range of musical phenomena - rhythm, metre, resolution, repetition, improvization - and through them opens up some of the central themes of the Christian faith - creation, salvation, eschatology, time and eternity, eucharist, election and ecclesiology. He shows that music can not only refresh theology with new models, but also release it from damaging habits of thought which have hampered its work in the past.