Columbia subject headings:
Harvard subject headings:
Duets (Unspecified instruments (2))--16th century--Parts.
Music--Manuscripts
Vocal duets, Unaccompanied--16th century.
Princeton subject headings:
Duets (Unspecified instruments (2))
Facsimiles.
Music--Manuscripts--Facsimiles.
Vocal duets, Unaccompanied.