This alternative version may be used for one or more verses, the people singing the melody.

This tune is likely the work of the composer named here, but has also been attributed to others as shown in the instances list above.

According to the Handbook to the Baptist Hymnal (1992), Old 100th first appeared in the Genevan Psalter, and "the first half of the tune contains phrases which may have existed in plainsong and folk song for centuries. The latter part of the tune and its overall form is the work of Louis Bourgeois, John Calvin's musical collaborator in the formation of the Genevan Psalter." (p. 88)