Columbia subject headings:
Choruses, Sacred (Mixed voices), Unaccompanied.
Harvard subject headings:
Part songs, Sacred.
Princeton subject headings:
Canons, fugues, etc. (Chorus)--Scores.
Choruses, Sacred (Mixed voices), Unaccompanied.
Fugues.
Motets.
Psalms (Music)--91st Psalm.
Psalms.
Scores.