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The picture of Mengelberg in the link you provided looks like a composite of Moe, Larry & Curly.
I'm one of those who relishes older recordings, the worde the sound, the more mistakes from the performers the better. When I went to the Pristine site, I was asked ro download some Adobe thingy. Is that alright? Will I be charged an arm and a leg? Can I hear it without the download?