Ths for that.
I could be wrong but I didn't know Horenstein had such a following in the late 50s. And although there had been british performances of Mahler since his death, the big revival hadn't begun.
The music critic of the London Times, [Eric Blom, d.1959!], had said of Mahler, "We don't want his sort here."
That's why it's a surprise to me , in that context, that 6000 people turned up for M8. He was clearly, in an underground sort of way, more popular than programming, recording and the stance of critics would suggest.
Ivor