Columbia subject headings:
Italian language--History--Congresses.
Music and language--Congresses.
Harvard subject headings:
Italian language--History--Congresses.
Libretto--Congresses.
Music and language--Congresses.
Music and language--History--Congresses.
Songs, Italian--Italy--History and criticism.
Princeton subject headings:
Italian language--History--Congresses.
Music and language--Congresses.
Music--Italy--History--Congresses.