With time, I find I like Otto Klemperer's work more and more. The twentieth century probably saw two absolutely paramount conductors: Furtwängler, and Klemperer. This view was sparked after the receipt from Ronald de Haas of Danish Radio broadcasts of the 1950s. Der grosser Otto conducting perfomances of Beethoven's Eroica, Brahms Fourth, and Mozart 29 (also including Beethoven's Leonore III). All works, and performances, are Klemperer classics. Scrupulous care over dynamics, balance and tempi. Indifference towards mere beauty of sound. The works, in their 1950s mono, really do sound "rugged". And nothing wrong with that, even in the Mozart symphony. Klemperer's Mozart used to disturb me a little. But now I find that I appreciate "Mozart without make-up". And no one does the Eroica or the Brahms fourth better than Otto! The sound in all the works is absolutely fine.