Furtwängler, although he had decided to remain in Germany, was certainly no Nazi [...] He had a private telephone line to me which was not connected via the exchange [...] Before going to bed, he used to chat with me over telephone. Sometimes I told him amusing stories to cheer him up, sometimes we talked about politics. One of the main threats the Nazis used against Furtwängler and myself later on was the assertion that they had recorded all these conversations. I should not have thought that it was possible! Was there enough shellac ? If the Nazis really did this, their ears must certainly have burnt, and it was not surprising that Furtwängler was eventually put on their black list, let alone myself.