Columbia subject headings:
Guido, d'Arezzo--Congresses.
Monastic and religious life--Italy--History--Middle Ages, 600-1500--Congresses.
Harvard subject headings:
Guido, d'Arezzo--Congresses.
Monastic and religious life--Italy--History--Middle Ages, 600-1500.
Musical notation--Italy--History.
Neumes--History and criticism.
Pomposa (Abbey). Biblioteca--History.
Pomposa (Abbey). Biblioteca--Manuscripts.
Princeton subject headings:
Guido, d'Arezzo--Congresses.
Monastic and religious life--Italy--History--Middle Ages, 600-1500--Congresses.