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In 1982, I managed a record store in Monterey, CA, where Mr. Anka lived at the time. (Might still, I dunno. I haven't been back there in 20 years.) One day, this short, balding man with a gold chain a-dangle in his chest hair and the pre-cancerous glow so popular among the jet set came into my store with a copy of Billboard under his arm. Yep, that's right: Paul Anka bought the top fifty albums that week. All of 'em. I don't remember precisely what was on the charts at the time, but I do have a memory of debating the merits of The Clash with him.
So it's entirely possible he came across that song on his own.
i love em, benzo and have for decades, but it is kinda easy-listening, mostly. True, Gold, To the Barricades (my fav of theirs), Only When You Leave...