Columbia subject headings:
Beethoven, Ludwig van, 1770-1827.
Music--Austria--Vienna--History and criticism.
Harvard subject headings:
Beethoven, Ludwig van, 1770-1827--Congresses.
Music--Austria--Vienna--Congresses.
Princeton subject headings:
Beethoven, Ludwig van, 1770-1827--Influence--Congresses.
Music--Austria--Vienna--20th century--History and criticism--Congresses.