Columbia subject headings:
Choruses, Sacred (Mixed voices), Unaccompanied.
Masses, Unaccompanied.
Motets.
Harvard subject headings:
Choruses, Sacred (Mixed voices), Unaccompanied.
Masses, Unaccompanied.
Motets.
Princeton subject headings:
Choruses, Sacred (Mixed voices), Unaccompanied.
Masses, Unaccompanied.
Motets.