In his book "Conversations with Karajan", Richard Osborne reports the
following remark Karajan made about Carlos Kleiber, which probably explain
why his [Kleiber's] discography is so short (I'm quoting from my version in
Portuguese):

   "He [Kleiber] has gift to conduct, but he doesn't like to do it.
   And he tells me:  'I conduct only when I am hungry'.  And it is true.
   He has a refrigerator that keeps completaly full; he cooks for himself,
   and when the refrigerator starts to get empty and reachs certain
   level, he thinks:  'Now maybe I give a concert'.  He is like a wolf!
   But he is someone I have the greatest admiration".

Wilson Pereira.