He composed for almost every genre and used his own cadenzas for Beethoven 's Piano Concertos 1 -- 4 .
A lesser - known activity of Kempff was composing .
Kempff composed for almost every genre and used Kempff 's own cadenzas for Beethoven 's Piano Concertos 1 -- 4 .
A lesser - known activity of Kempff was composing .