Conversation so far:
Where was theater's Michael Bennett born?
Michael Bennett was born Michael Bennett DiFiglia in Buffalo, New York.
When was theater's Michael Bennett born?
Michael Bennett was born April 8, 1943.
Who are theater's Michael Bennett's parents?
Michael Bennett was born to Helen (née Ternoff), and Salvatore Joseph DiFiglia.
when did theater's Michael Bennett's career begin?
Michael Bennett studied dance and choreography and staged shows in his local high school before dropping out to accept the role of Baby John in the West Side Story.

Question: what was the play?
Self-contained rewrite: what was the musical in which theater's Michael Bennett's career began?