Question: The Unanswered Question is a ballet made from work by a man who was regarded as what?
Sentence (from "The Unanswered Question (ballet)"): The premiere took place April 30, 1988, at the New York State Theater, Lincoln Center, as part of New York City Ballet's American Music Festival with lighting by the Feld Ballet's Allen Lee Hughes and Willa Kim's costumes.
Relevant evidence: No