Columbia subject headings:
Carnival songs--History and criticism--Congresses.
Carnival--History--Congresses.
Musical theater--History--Congresses.
Theater--History--Congresses.
Harvard subject headings:
Carnival--History--Congresses.
Musical theater--History--Congresses.
Theater--History--Congresses.
Princeton subject headings:
Carnival--History--Congresses.
Musical theater--History--Congresses.
Theater--History--Congresses.