The Stories behind Famous Hymns Knocking, Knocking Words by Mrs. Harriet Beecher Stowe Music by George F. Roet "Knocking, knocking, who is there? Waiting, waiting, oh, how fair!” This hymn was written by Mrs. H. B. Stowe, the well-known author of”Uncle Tom's Cabin. ”Mrs. Stowe wrote several hymns, but this is perhaps the most popular. The tune was written by George F. Root.