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.
What was his first recording?
Notable classical recordings include the complete cycles of Mozart, Beethoven and Schubert's piano sonatas, and Mozart's piano concertos.
Any interesting information?
To mark Barenboim's 75th birthday, Deutsche Grammophon released a box set of 39 CDs of his solo recordings.
Anything else?
Sony Classical issued a box set of Barenboim's orchestral recordings on 43 CDs and three DVDs in 2017.

Question: How long was his career?
Self-contained rewrite: How long was Daniel Barenboim's career?