Columbia subject headings:
Church music--Catholic Church.
Church music--Spain--Zamora.
Harvard subject headings:
Church music--Catholic Church
Church music--Spain--Zamora--15th century.
Church music--Spain--Zamora--500-1400.
Church music--Spain--Zamora.
Gregorian chants--History and criticism.
Princeton subject headings:
Church music--Catholic Church.
Church music--Spain--Zamora--15th century.
Church music--Spain--Zamora--500-1400.