This piece starts out in the key of C minor, transitioning to C major at the double bar.

Sources for French lyrics, English adaptation (circa 1899), and choral arrangement (circa 1899): https://imslp.org/wiki/Repentir,_CG_434_(Gounod,_Charles)

Orchestral reference (transposed up from the key of C to D): https://www.youtube.com/watch?v=DjBcXh5mHwc

Choral reference: https://www.youtube.com/watch?v=bkVAPm5x2tM

09/02/2024 Update: I consolidated the separate French, English, and Spanish solo versions into a single arrangement. This is the arrangement by Alfred William Phillips under one of his many pseudonyms Leigh Kingsmill, and was published in London around 1899. It is the most common arrangement to be found, and lends itself well to piano or organ.

O Divine Redeemer – Charles Gounod (Phillips-Solo) by Jason Hunsaker

This is the arrangement by Émile Paladilhe, a concert pianist, first published 15 December 1894. It is much more complex than Phillips' arrangement.

O Divine Redeemer – Charles Gounod (Paladilhe-Solo) by Jason Hunsaker

This is the arrangement by Jules Delsart, a concert cellist, first published in Paris around 1895. It is for a small ensemble consisting of a vocal soloist, violin or cello, harp or piano, and organ.

O Divine Redeemer – Charles Gounod (Delsart-Solo) by Jason Hunsaker