Re: Furtwangler's 1942 Beethoven 9th, I know music transcends, etc. but I have a hard time with the idea of Germans singing "Alle Menschen Werden Bruder" in 1942 when their relatives and neighbors are committing genocide in their name. It's a sick joke, not uplifting.
Here's my recommendation:
(And I know FiDi served in the Wehrmacht on the Eastern Front. He probably saw, and may have participated in, some horrifying things, which makes this combination of composition and performance so much more the chilling.)