Her final screen appearance was as the gentle, wise Mother Abbess in The Sound of Music (1965), for which she was nominated for the Academy Award for Best Supporting Actress and the Golden Globe Award for Best Supporting Actress - Motion Picture. She was thrilled to be in the movie although she knew that she could no longer sing "Climb Ev'ry Mountain ''. She was dubbed (for singing) by Margery McKay. In her autobiography, Marni Nixon, who appeared in the film as Sister Sophia, said Peggy especially liked McKay 's singing voice because she sounded as Peggy did in her younger days.
who sang for mother superior in the sound of music
Margery McKay