Conversation so far:
When were some of Jeanette MacDonald's performances?
On December 12, 1951, Jeanette MacDonald did one performance of Faust with the Philadelphia Civic Grand Opera Company at the Academy of Music.
What roles did Jeanette MacDonald play?
Jeanette MacDonald played the roles of Juliet in Romeo and Juliet and Marguerite in Faust.

Question: What did critics say?
Self-contained rewrite: What did critics say?