Conversation so far:
When was Daniel Barenboim born?
15 November 1942
Where was Daniel Barenboim born?
Buenos Aires, Argentina
How was Daniel Barenboim's relationship with his parents?
Did Daniel Barenboim move away from Buenos Aires?
In 1952, Barenboim's family moved to Israel.
Why did Daniel Barenboim's family moved to Israel in 1952?
Did Daniel Barenboim do anything relevant in Israel after his family moved in 1952?
Was Salzburg responsible for Daniel Barenboim's career?
In the summer of 1954, Daniel Barenboim's parents took him to Salzburg to take part in Igor Markevitch's conducting classes.

Question: what did Wilhelm Furtwangler teach him?
Self-contained rewrite: What did Wilhelm Furtwanger teach Daniel Barenboim?