First published in the 1551 edition of the Genevan Psalter, GENEVAN 121 is in HypoMixolydian mode. Howard Slenk (PHH 3) provided the harmonization.
GENEVAN 121 is presented in original rhythm rather than in all even notes, as it had been in earlier editions of the Psalter Hymnal. The melody consists of two groups of three phrases in which phrases 2 and 3 are linked without a break. Because each phrase has its own rhythmic pattern, this tune may be difficult for some people to sing. That difficulty is balanced by the ease of the melodic intervals, which are almost always stepwise. Sing the tune with confidence, especially after the question in stanza 1.
--Psalter Hymnal Handbook, 1988