Columbia subject headings:
Gluck, Christoph Willibald, Ritter von, 1714-1787. Operas.
Opera--18th century.
Harvard subject headings:
Gluck, Christoph Willibald, Ritter von, 1714-1787. Operas
Opera--18th century
Princeton subject headings:
Gluck, Christoph Willibald, Ritter von, 1714-1787. Operas.
Opera--18th century.