Kalkbrenner werd medebestuurslid van de Parijse pianofabriek van Pleyel & Co, en verdiende veel geld door de combinatie van zijn uitvoerend-musicusschap en de handel in instrumenten. ###>(...) I was very much amused by Kalkbrenner, who, in playing to me, made a mistake which brought him to a standstill; but the way in which he recovered himself was marvellous.