According to the Wiener Symphoniker website the performance took place in Musikverein 19 June 1960. I have experienced Mahler's eighth symphony in about twenty different performances: live concerts, broadcasts, and recordings. Of these, only the Decca/Solti version can boast soloists who can compete with this concert. Mahler wrote unforgiving parts for all, and before hearing Wunderlich I've always thought that the tenor solos in the eighth were a miscalculation. Even W must strain a little, but I now think that was what Mahler intended.In fact, everyone acquits themselves well in a work which the orchestra had played a few times during the 1950s when it was still very uncommon. It's much to be preferred to their 1951 concert under Scherchen once on pioneering Columbia LPs, and I believe also to the Vienna Phil/Mitropoulos in Salzburg August 1960. Orchestra soloists are excellent, and the choruses sound well trained.The recording is stunning for a mono broadcast recorded off-the-air 64 years ago. There is very occasional FM static. The home recordist must have had good equipment and stored the tape well all these years. The task of the balance engineer of course was to limit dynamics to what radio listeners would accept, and pick out the essential strands in the complex score. The result is that perspectives change, but s/he knew the music and had microphones placed so that every vocal or instrumental solo is clearly heard, as well as the boys' chorus. Frequency range allows the organ to be clearly heard too. Of course the overwhelming whole could barely be captured even in stereo and under studio conditions, but I found this very satisfying - a bit like when Berg or Schönberg marked one voice Hauptstimme. Here the engineer has decided for us which it is. A recording to come back to.