Klieber's Brahms

Thanks to the wonders of YouTube, I've found a video of Carlos Kleiber conducting Brahms' 4th Symphony. Here's the brilliant passacaglia finale:

(In a Guardian essay ahead of the Concertgebouw's performance of the 4th at the Barbican on Friday, Paul Jansser quotes Eduard Hanslick's famous initial reaction to a two piano version of the symphony: 'During the entire piece I had the feeling I was being punched by two exceptionally intelligent people.')