Can you solve this musical mystery?

Can you solve this musical mystery?
Er, that’s it. All efforts to identify it over the decades have come to naught. It’s almost certainly Cancon. Those have been consulted seem thing recall that the name of the artist begins with some initials (like JJ, but necessarily that). A reader of this website came to me with a mystery: a song he’d recorded from the radio years and years ago has languished unidentified. Here’s what we know:

It was heard on Montreal Top 40 radio around 1975. Can anyone figure this out?