Columbia subject headings:
Harvard subject headings:
Choruses, Sacred (Mixed voices, 4 parts), Unaccompanied--16th century.
Choruses, Sacred (Mixed voices, 4 parts), Unaccompanied--17th century.
Motets
Motets--16th century
Motets--17th century.
Scores
Vocal music--Spain--16th century.
Vocal music--Spain--17th century.
Princeton subject headings:
Choruses, Sacred (Mixed voices, 4 parts), Unaccompanied.
Motets.
Spanish music.