GENEVAN 105 was first published in the 1562 edition of the Genevan Psalter as a setting for Theodore de Beze’s versification of Psalm 105. Howard Slenk (PHH 3) composed the harmonization in 1985. Another sturdy tune from Calvin's psalter, GENEVAN 105 is in Ionian mode (major) and consists of six lines, each pair of which has the same rhythmic pattern.
The optional repeat of musical line 4 in stanza 7 permits the narration of the plagues in Egypt. The repetition will help the congregation yearn for deliverance from that musical phrase–giving them a taste of how the Hebrew people must have felt! The complete psalm may be sung antiphonally. Sing the tune with much vigor and with a majestic tempo.
--Psalter Hymnal Handbook, 1988