Columbia subject headings:
Harvard subject headings:
Opera--18th century--Congresses.
Opera--19th century--Congresses.
Opera--Austria--Vienna--Congresses.
Salieri, Antonio, 1750-1825--Congresses.
Princeton subject headings:
Opera--Austria--Vienna--18th century.
Opera--Austria--Vienna--19th century.
Salieri, Antonio, 1750-1825--Criticism and interpretation.