Columbia subject headings:
Ballet--Austria--Vienna--History--18th century.
Metastasio, Pietro, 1698-1782--Anniversaries, etc.
Metastasio, Pietro, 1698-1782.
Opera--Europe--History--18th century.
Opera--Italy--History--18th century.
Opera.
Harvard subject headings:
Princeton subject headings:
Metastasio, Pietro, 1698-1782.