The post on Otto Klemperer brings this note from Bob Gartside, melodie-ist and singer extraordinaire. And a sweet guy.
Fischer-Dieskau was doing one of the Bach Passions with Klemperer and was dying at the slowness of the tempo, he aked the maestro if they could go faster. "Vell Fieskau" growls Klemperer, who always said 'Fieskau', "ve'll tink about it." Dieskau comes back the next day and says, "Maestro I had a dream that I met Bach and he agreed the tempi are too slow." "Oh", replied Klemperer, "Ve vill tink about it a little more." The next day at rehearsal, Klemperer calls Dieskau over and says, "Fieskau, I too dreamed I met Bach. He said he never heard of you!"