Conversation so far:
When did Anton Rubinstein start his American tour?
At the behest of the Steinway & Sons piano company, Anton Rubinstein toured the United States during the 1872–3 season.
Where did Anton Rubinstein visit first on his American tour?
How was Anton Rubinstein's performance received in America?

Question: Who did he meet in America?
Self-contained rewrite: Who did Anton Rubinstein meet in America?