<P> 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 . </P>
<P> 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 . </P>
who sang for mother superior in the sound of music
who sang for mother superior in the sound of music
Margery McKay
Margery McKay