The "Geese Book" (New York, Pierpont Morgan Library, M. 905) was completed in 1510 for the parish of St. Lorenz in Nuremberg; it is a large-format gradual that preserves the mass liturgy sung by the boys choir until the Reformation. This multimedia exploration of the gradual includes performances of chants by the Schola Hungarica, videos about the creation of the book, as well as full-color digital images.