Conversation so far:
Where was James Levine born?
Levine was born in Cincinnati, Ohio.
Did James Levine go to school?
Levine graduated from Walnut Hills High School, an acclaimed magnet school in Cincinnati.
Did James Levine continue his education after graduating Walnut Hills High School?
Levine entered the Juilliard School of Music in New York City in 1961, and took courses in conducting with Jean Morel.

Question: When did he graduate?
Self-contained rewrite: When did James Levine graduate from Juilliard School of Music?