Columbia subject headings:
Humor in music--Congresses.
Opera--France--18th century--Congresses.
Opera--France--19th century--Congresses.
Harvard subject headings:
Opéra comique--France--18th century.
Opéra comique--France--19th century.
Princeton subject headings:
Humor in music--Congresses.
Opera--France--18th century--Congresses.
Opera--France--19th century--Congresses.