Conversation so far:
Did Jascha attend college?
CANNOTANSWER.
Did he make any professional musical releases during his career?
Heifetz made his first recordings in Russia during 1910-11.
What was Heifetz's most famous work?
He recorded the Beethoven Violin Concerto in 1940 with the NBC Symphony Orchestra conducted by Arturo Toscanini.

Question: Did Heifetz play any other instruments?
Self-contained rewrite: Did Jascha Heifetz play any other instruments besides violin?