Because of Jim Rodford's recent and unexpected death, I've been listening to Argent albums. Yester-day I listened to Circus (the first Argent album with a song written by Rodford: "Trapeze"), and I noticed a small thing about "Shine on Sunshine."
In the second verse, after the line "The rain that breaks your heart" in the lead vocals, that same line is sung in the backing vocals to a melody something like:
(I guessed on the key based on the pitches in this phrase.)
The "breaks" is sung with a melisma (G# to A# in the second measure), giving a musical impression of the breaking.
I referenced the version that the Zombies recorded for Breathe Out, Breathe In, but it doesn't have this feature because the second half of the verse is re-written (along with other sections of the song). In Argent's version, I think it's:
Better yet by far
The best I ever saw
The rain that breaks your heart
Won't bend our love for sure
But in the Zombies' version, it's:
Better yet by far
The best I ever saw
Each time the clouds start crying
She dries their tears once more