Columbia subject headings:
Harvard subject headings:
Choruses, Sacred (Mixed voices) with organ.
Gregorian chants.
Part songs, Sacred.
Thomas, à Becket, Saint, 1118?-1170--Songs and music.
Princeton subject headings:
Choruses, Sacred.
Gregorian chants.
Motets.
Thomas, à Becket, Saint, 1118?-1170--Songs and music.