Columbia subject headings:
Harvard subject headings:
Masses, Unaccompanied.
Part songs, Sacred.
Princeton subject headings:
Excerpts.
Masses, Unaccompanied--500-1400--Excerpts.
Masses, Unaccompanied.
Masses.
Music--France--500-1400.
Sacred vocal music--500-1400--Scores.
Scores.