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The Father's Holy Ones, the Blest is written by the Benedictine Nuns of Stanbrook Abbey. In the Divine Office (1974) it is sung at Morning Prayer on November 1st, the Solemnity of All Saints. The Office recommends the hymn tune: Auctoritate Saeculi as it's musical setting. An alternative tune that can also be used is Duke Street, as featured in the following video.
Alternative Tune: Duke Street