- Beethoven, Ludwig van, 1770-1827 (11)
- Beethoven-Haus (Bonn, Germany) (2)
- Brandenburg, Sieghard (2)
- Ladenburger, Michael (2)
- Appel, Bernhard R. (1)
- Del Mar, Jonathan (1)
- Frohlich, Martha (1)
- Kerman, Joseph, 1924- (1)
- Kinderman, William (1)
- Lockwood, Lewis (1)
- Mauser, Siegfried (1)
- Rebmann, Martina, 1965- (1)
- Steinbeck, Wolfram, 1945- (1)