Columbia subject headings:
Music--19th century--History and criticism.
Music--20th century--History and criticism.
Musical form.
Pfitzner, Hans, 1869-1949.
Wagner, Richard, 1813-1883.
Harvard subject headings:
Music--19th century--History and criticism
Music--20th century--History and criticism
Music--Philosophy and aesthetics
Musical form.
Pfitzner, Hans Erich, 1869-1949.
Pfitzner, Hans, 1869-1949
Wagner, Richard, 1813-1883
Princeton subject headings:
Music--20th century--History and criticism.