Singer Marni Nixon to discuss singing -- uncredited -- for the stars

Long before another Nixon got mixed up with a secret recording in Washington, Marni Nixon was one of the best-loved voices nobody knew. While stars like Deborah Kerr, Audrey Hepburn and Natalie Wood received the applause and record royalties for their work in musicals such as "The King and I," "My Fair Lady" and "West Side Story," it was Nixon's soprano who sang their songs uncredited, often after signing a contract never to disclose the ruse.