Columbia subject headings:
Beethoven, Ludwig van, 1770-1827--Criticism and interpretation.
Depth (Philosophy)
Mozart, Wolfgang Amadeus, 1756-1791--Criticism and interpretation.
Music--Philosophy and aesthetics.
Harvard subject headings:
Beethoven, Ludwig van, 1770-1827--Criticism and interpretation.
Depth (Philosophy)
Mozart, Wolfgang Amadeus, 1756-1791--Criticism and interpretation.
Music--Philosophy and aesthetics
Princeton subject headings: