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In the film, we see that Kathy is dubbing Lina's voice. When Debbie Reynolds was supposed to be dubbing Jean Hagen's voice, who actually did the singing for the song, "Would You"?
Answer: Betty Noyes
Interesting, in real life, Jean Hagen actually had a beautiful singing voice. Kind of hard to believe, isn't it? Betty Noyes provided the singing voice for the one song "Would You?". Jean Hagen provided Lina's squeaky voice and the voice in "The Dancing Cavalier", but Betty sang that one song.