A big collection of various monkey organs on tapes is available from
Wilfried Hoemmerich, Bonn, president of Club Deutscher Drehorgelfreunde
(CDD).  Try going over their web page to reach him:

  http://www.bubis.com/cdd/

Most of the music is also available as LP or CD.

greetings by(e) InK - Ingmar Krause
ERlanger drehORGEL-Trio, Familie Krause, erorgelt@erlangen.franken.de