Conversation so far:
When was Daniel born?
1942.
Where was Daniel born?
Buenos Aires, Argentina.
How was Daniel's relationship with his parents?
He started piano lessons at the age of five with his mother, continuing to study with his father.
Did he move away from Buenos Aires?
Barenboim's family moved to Israel.
Why?
CANNOTANSWER.
Did he do anything relevant in Israel?
Two years later, in the summer of 1954, his parents took him to Salzburg to take part in Igor Markevitch's conducting classes.
Was Salzburg responsible for his carreer?
During that summer he also met and played for Wilhelm Furtwangler, who has remained a central musical influence and ideal for Barenboim.

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