“I Will Be a Child of Peace” by Elaine Hagenberg offers an origins two-fer: the beginning of her career as a published choral composer/arranger and the source of the music itself. “Peace” was Hagenberg’s first published piece back in 2013. The piece has now been voiced for SATB, TTBB, and SSA. She must really like it!
The original song is a Shaker hymn:
“O Holy Father,” according to manuscripts, originated in 1851. [The manuscripts] attribute it to Alonzo Gilman of the community in Alfred, Maine. Sr. Mildred said that in her youth the song was used very frequently “at the close of prayer services while we were on our knees.” The song is in 5/4 time. (Notes on Songs in the Film, Shakers)