Conversation so far:
What is Daniel Barenboim's style?
Daniel Barenboim has rejected musical fashions based on current musicological research, such as the authentic performance movement.
What are some of the composers that Daniel Barenboim rejected?
Daniel Barenboim has not been influenced by the faster tempos chosen by other conductors such as David Zinman and authentic movement advocate Roger Norrington.

Question: How else did he develop his musical style?
Self-contained rewrite: How else did Daniel Barenboim develop his musical style?