Columbia subject headings:
Berg, Alban, 1885-1935.
Mahler, Gustav, 1860-1911.
Music--History and criticism.
Wagner, Richard, 1813-1883.
Harvard subject headings:
Berg, Alban, 1885-1935
Mahler, Gustav, 1860-1911.
Music--History and criticism
Wagner, Richard, 1813-1883
Princeton subject headings: