Columbia subject headings:
Music--Italy--History and criticism--Congresses.
Musicology--Congresses.
Pirrotta, Nino--Congresses.
Harvard subject headings:
Music--Italy--History and criticism--Congresses.
Musicology--Congresses.
Pirrotta, Nino--Congresses.
Princeton subject headings:
Musicology--Congresses.
Pirrotta, Nino--Congresses.