Darby is also notable as the author of The Brownstone House of Nero Wolfe (1983), a biography of the home of Rex Stout's fictional detective.

Darby also performed as part of "The King's Men," a vocal quartet who recorded several songs with Paul Whiteman's orchestra in the mid 1930s and were the featured vocalists on the Fibber McGee and Molly radio program from 1940 through 1953.

The King's Men portrayed the Marx Brothers in a musical spoof in the film Honolulu (Darby played one of two 'Grouchos' in the group).

[2] Darby was often asked about his decision to credit the song to his wife along with Presley, and his standard response was an acid, "Because she didn't write it either.

[3] Ken Darby died January 24, 1992, in the final stages of production of his last book, Hollywood Holyland: The Filming and Scoring of 'The Greatest Story Ever Told' (1992).