who sang maria's part in west side story
Marni Nixon Margaret Nixon McEathron (February 22, 1930 – July 24, 2016), known professionally as Marni Nixon, was an American soprano and ghost singer for featured actresses in movie musicals. She is now well-known as the real singing voices of the leading actresses in films, including The King and I, West Side Story, and My Fair Lady, although this was concealed at the time from audiences.[1]