Columbia subject headings:
Harmony.
Wagner, Richard, 1813-1883--Harmony.
Wagner, Richard, 1813-1883. Tristan und Isolde.
Harvard subject headings:
Harmony.
Wagner, Richard, 1813-1883--Harmony.
Princeton subject headings:
Harmony.
Wagner, Richard, 1813-1883--Harmony.
Wagner, Richard, 1813-1883. Tristan und Isolde.