"I'll Keep Trying"

Last week, I was thinking about "I'll Keep Trying" and had a couple realizations about the chorus, specifically this section:

'Cause I'll keep tryin' 'til you come on home

Keep tryin' 'til my time has come

Keep tryin' 'til you come on home to me

It's sung to a melody something like this:

The notes to which the "tryin'"s are sung have the longest values (aside from the one to which "me" at the end is sung), and this extended duration matches the persistency of "keep."

The repetition of "keep tryin'" (as anaphora in the lead vocals and as a sort of stretto in the overdubbed backing vocals) also gives a sense of constancy.