Columbia subject headings:
Beethoven, Ludwig van, 1770-1827--Knowledge and learning.
Harvard subject headings:
Beethoven, Ludwig van, 1770-1827--Knowledge and learning.
Princeton subject headings:
Albrechtsberger, Johann Georg, 1736-1809.
Beethoven, Ludwig van, 1770-1827--Knowledge and learning.
Haydn, Joseph, 1732-1809.
Salieri, Antonio, 1750-1825.