Marni Nixon is one of the most heard musical voices in movies. She dubbed the singing of Deborah Kerr in ‘The King and I”, Audrey Hepburn in “My Fair lady” and Natalie Wood in “West Side Story”. She did NOT dub Julie Andrews in “The Sound of Music” but she did play Sister Sophia in the movie.

(The Great Courses – Great American Music: Broadway Musicals)