Question: What opera starring Mary LeSawyer had its premiere in Philadelphia in 1946?
Sentence (from "Iruvar (TV series)"): It replaced Azhagiya Thamizh Magal and it broadcast on MediaCorp Vasantham on Monday to Thursday from December 11, 2016 to 29 March 2017 at 22:00 (SST) for 62 Episodes.
Relevant evidence: No