Title: Il Libro del maestro
Subjects: Congresses, Gregorian chants, Manuscripts, Catholic Church, Music, Liber magistri, History and criticism, Biblioteca capitolare (Piacenza, Italy), Congrès, Liturgie, Sources, Vie religieuse, Biblioteca e Archivio Capitolare, Musikhandschrift, Ms. 65, Biblioteca e archivio capitolare (Plaisance, Italie) MS. 65, Piacenza, Liber magistri : codex 65