Question: What opera starring Mary LeSawyer had its premiere in Philadelphia in 1946?
Sentence (from "Mary LeSawyer"): Mary LeSawyer (October 8, 1917; Shamokin, Pennsylvania – June 13, 2004; Orlando, Florida) was an American opera singer of Ukrainian descent who had an active international career during the 1940s through the 1960s.
Relevant evidence: No