Columbia subject headings:
Berno, Abbot of Reichenau, -1048.
Hermannus, Contractus, 1013-1054.
Music theory--History--500-1400.
Harvard subject headings:
Berno, Abbot of Reichenau, -1048
Hermannus, Contractus, 1013-1054.
Music theory--History--500-1400.
Music theory--Medieval.
Princeton subject headings:
Berno, Abbot of Reichenau, -1048.
Hermannus, Contractus, 1013-1054.
Music theory--History--500-1400.