Columbia subject headings:
Music--Philosophy and aesthetics--Congresses.
Wagner, Richard, 1813-1883--Criticism and interpretation--Congresses.
Harvard subject headings:
Music--Philosophy and aesthetics--Congresses
Wagner, Richard, 1813-1883--Criticism and interpretation--Congresses.
Princeton subject headings:
Music--Philosophy and aesthetics--Congresses.
Wagner, Richard, 1813-1883--Criticism and interpretation--Congresses.