One day, it will be worth devoting a study or podcast to Furtwängler's performance of Mozart's Serenade K.361 for 13 winds, better known as the Gran Partita, an appellation that is not, by the way, the composer's own.
Contrary to what one might imagine, Furtwängler performed it quite late, in 1941, both in Vienna and in Berlin. And very surprisingly, he rarely performed it in its entirety, at least once, on the HMV recording in 1947.
At the Wiener Philharmoniker's concert on 9 February 1941, this ambitious work was performed alongside another masterpiece, Bruckner's Seventh. Here is the facsimile of the programme.
Furtwängler conducting the Vienna Philharmonic, March 1942