Opening the Geese Book presents the full facsimile of the two-volume manuscript New York, Morgan, M. 905; selected chants recorded by the Schola Hungarica; videos with historical information; and critical commentary in English and German, codicological analysis, archival sources, and bibliography. Produced in Nuremberg between 1503 and 1510, the Geese Book preserves the complete mass liturgy compiled for the parish of St. Lorenz and used until the Reformation was introduced in the city in 1525. The manuscript is famous for its representations of animals, wild folk, and a dragon. Saints’ days and other festivals can be accessed easily via a drop-down menu.