One of the 246 hymn tunes by Joseph Barnby (PHH 438), JORDAN was published in The Hymnary (1872) as a setting for "Sing to the Lord a Joyful Song." JORDAN contains several repeated phrases. Barnby originally composed the tune to be sung in harmony with phrases 5 and 7 sung in unison, although the full accompaniment was included for organ. But have the congregation sing in unison throughout, perhaps with one stanza in harmony.
--Psalter Hymnal Handbook