Columbia subject headings:
Music and literature--History--17th century.
Music and literature--History--18th century.
Music and literature--History--19th century.
Musical theater--History and criticism--17th century.
Musical theater--History and criticism--18th century.
Musical theater--History and criticism--19th century.
Musical theater--Philosophy and aesthetics.
Opera--17th century.
Opera--18th century.
Opera--19th century.
Opera--Philosophy and aesthetics.
Harvard subject headings:
Music and literature--History.
Musical theater--History.
Princeton subject headings:
Music and literature--History--17th century.
Music and literature--History--18th century.
Music and literature--History--19th century.
Musical theater--History and criticism--17th century.
Musical theater--History and criticism--18th century.
Musical theater--History and criticism--19th century.
Musical theater--Philosophy and aesthetics.
Opera--17th century.
Opera--18th century.
Opera--19th century.
Opera--Philosophy and aesthetics.