Columbia subject headings:
Keller, Gottfried, 1819-1890--Criticism and interpretation.
Keyserling, Eduard von, 1855-1918--Criticism and interpretation.
Mann, Thomas, 1875-1955--Criticism and interpretation.
Singing in literature.
Vocal music in literature.
Harvard subject headings:
Keller, Gottfried, 1819-1890--Criticism and interpretation.
Keyserling, Eduard von, 1855-1918--Criticism and interpretation.
Mann, Thomas, 1875-1955--Criticism and interpretation.
Music in literature.
Princeton subject headings:
Keller, Gottfried, 1819-1890--Criticism and interpretation.
Keyserling, Eduard von, 1855-1918--Criticism and interpretation.
Mann, Thomas, 1875-1955--Criticism and interpretation.
Music in literature.