Conversation so far:
What was Michael Bennett's earliest musical that he worked on?
Michael Bennett made his choreographic debut with A Joyful Noise (1966)
How did the 1960's hit do with Michael Bennett?
A Joyful Noise (1966) lasted only twelve performances, and in 1967 followed it with another failure, Henry, Sweet Henry (based on the Peter Sellers film The World of Henry Orient).
What was one of Michael Bennett 's successes in 1960?
Success finally arrived in 1968, when Michael Bennett choreographed the hit musical Promises, Promises on Broadway.

Question: What else was there that taught him to do shows as he does later in his career?
Self-contained rewrite: What other hits were there that taught Michael Bennett  to do sows as he does later in his career?