It is a great pity that Marian Friedman has never received the attention she undoubtedly deserved. Some of her recordings are without peer such as her recording of the Beethoven Variations by Robert Schumann, only available on a long deleted LP . http://www.ebay.ie/itm/MARIAN-FRIEDMAN-Romantische-Etuden-Klavier-NM-SWISS-IMPORT-LP-/371429246086?hash=item567ae88486
Here is an equally ultra rare Video from lessons with Peter Feuchtwanger ( from 7.29 you can hear a short excerpt of those Schumann Variations ). https://www.youtube.com/watch?v=31NHUWEVBQY I guess the tape originates from the 1970 ies.
I have never heard another pianist like her and cannot highly enough recommed to go after those few elusive moments that captured her great art.