Conversation so far:
What was Anton Rubinstein's technique?
Villoing had worked with Rubinstein on hand position and finger dexterity.
What did the critics say about Anton Rubinstein's technique?
Critic Harold C. Schonberg describes Rubinstein's playing as that of extraordinary breadth, virility and vitality, immense sonority and technical grandeur in which all too often technical sloppiness asserted itself.“
Who did Anton Rubinstein learn his techniques from?
From watching Liszt, Rubinstein had learned about freedom of arm movement.
Did Anton Rubinstein teach anyone else his piano technique?

Question: Did he play any other instruments?
Self-contained rewrite: Did Anton Rubinsteinplay any other instruments besides piano?