Wilhelm Kempff
Cadenzas for the Fourth Piano Concerto have been written by a number of pianists and composers throughout its history; these include Beethoven himself (two separate sets of cadenzas), Johannes Brahms, Clara Schumann, Ferruccio Busoni, Hans von Bülow, Ignaz Moscheles, Camille Saint-Saëns, Anton Rubinstein, Wilhelm Kempff, Nikolai Medtner, Eugen d'Albert, Leopold Godowsky, Wilhelm Backhaus, Samuil Feinberg, Manuel M. Ponce, etc.