Columbia subject headings:
Aesthetics.
Music--Philosophy and aesthetics--19th century--History and criticism.
Opera.
Schopenhauer, Arthur, 1788-1860.
Wagner, Richard, 1813-1883--Criticism and interpretation.
Harvard subject headings:
Music--19th century--History and criticism
Music--Philosophy and aesthetics--History--19th century.
Opera
Schopenhauer, Arthur, 1788-1860--Contributions in aesthetics.
Wagner, Richard, 1813-1883--Criticism and interpretation.
Princeton subject headings:
Music--Philosophy and aesthetics.
Schopenhauer, Arthur, 1788-1860--Views on dreams.
Schopenhauer, Arthur, 1788-1860.
Wagner, Richard, 1813-1883. Literary works. Selections. English