Columbia subject headings:
Church music--Catholic Church.
Ivrea codex.
Motets--500-1400.
Music--500-1400--History and criticism.
Harvard subject headings:
Biblioteca capitolare (Ivrea, Italy)
Church music--Catholic Church
Ivrea codex.
Motets--500-1400--History and criticism.
Motets--History and criticism.
Music--500-1400--History and criticism
Music--Italy--14th century--History and criticism.
Part songs, Italian--History and criticism.
Princeton subject headings:
Ivrea codex.
Motets--History and criticism--France--500-1400.
Music--France--14th century--History and criticism.
Part songs, French--500-1400--History and criticism.