Sister Sophia from The Sound of Music. The one singing about how perhaps Maria isn't a problem after all but a "A will-o'-the wisp!" She also was the voice of Maria in West Side Story and sung for Aubrey Hepburn's part in the original My Fair Lady film! She has other credits, such as, Grandmother Fa in Disney's Mulan and the voice of Deborah Kerr in The King and I. At the age of 78, she was still a joy to watch on stage.
I'm really glad I went to the theater tonight!