Conversation so far:
What instrument did Daniel play?
a conductor.
What type of music did Daniel conduct?
Beethoven, Brahms, Bruckner, Schubert and Schumann, the Da Ponte operas of Mozart, numerous operas by Wagner.
Did he get the chance to work with Beethoven?
He made his first recording in 1954.

Question: What was his first recording?
Self-contained rewrite: What was Daniel Barenboim's first recording?