Theory: Accompanist on 1890 cylinders is Anton Rubinstein.

SDC Legendz Pianistz
21

Yes, it’s other session, probabry this take is 2 ~ 3 years later from APR unpublished take.

22

Oh wow! Ok!
Looking forward to it. As we said, even if 2 more minutes of Friedman are discovered, they are very precious indeed!