Columbia subject headings:
Christmas music.
Gregorian chants.
Oracula Sibyllina--Musical settings.
Sacred vocal music--Spain--16th century.
Sacred vocal music--Spain--500-1400.
Harvard subject headings:
Princeton subject headings:
Chants.
Christmas music.
Gregorian chants.
Oracula Sibyllina--Musical settings.
Sacred vocal music--Spain--16th century.
Sacred vocal music--Spain--500-1400.