The mentions of  Ossip Gabrilowitsch tweaked my memory.  While
researching a different topic recently, I came across a mention of him:

"Ossip Gabrilowitsch   Conductor of the Detroit Symphony Orchestra,
and distinguished pianist, who was a guest at luncheon at the
Exposition last week."

in _Progress: A century of Progress, International Exposition_, 1933,
v. 2, n. 16, p. 2.

In Twain circles, he is cast most often as a villain, so it was
interesting to see him noted in a more flattering light.   Of course,
_Progress_ was a promotional periodical intended to generate interest
and enthusiasm for the 1933 Exposition, and thus would mention anyone
of note who had even a cursory connection to it.  Still, that he would
be mentioned along with other celebrities gives us some sense of how
he was viewed in his day.

LH