Columbia subject headings:
Conductus.
Motets.
Organa.
Sacred vocal music--500-1400.
Sequences (Music)
Tropes (Music)
Harvard subject headings:
Music--500-1400
Music--Manuscripts--Facsimiles.
Part songs, Sacred.
Princeton subject headings:
Music--500-1400.
Music--Manuscripts--Facsimiles.
Part songs.
Sacred vocal music.