The American soprano that sang in "West Side Story" dubbed for who in a 1956 film adaptation?
Getting to Know You (song):  It was first sung by Gertrude Lawrence in the original Broadway production and later by Marni Nixon who dubbed for Deborah Kerr in the 1956 film adaptation. Marni Nixon: Margaret Nixon McEathron (February 22, 1930 – July 24, 2016), known professionally as Marni Nixon, was an American soprano and playback singer for featured actresses in movie musicals.
Deborah Kerr