I provided the link, not sure the veracity of it. Where did you get your list? Google didn't show anything within the first three pages that matches your list, but maybe google is slipping a little.
I thought Louis Armstrong was a bit weird too.
80sxchange.com listing, but they don't seem to credit the list.
Your linked site showed further down an alleged Billboard top 10 or 20; different from the list you had was at the top and said "greatest songs" - whatever that means.
I don't know exactly the source of mine, but it *is* closer to your linked site's list of Billboard top 20. Maybe they modified it over the years w/more accurate #s? (1 thing I know - the '85 list is correct, at least at the time. I recorded from Kasem's top 100 show and remember distinctly the curiousity of "Lovergirl" and "Loverboy" being right next to each other in the line-up at the spots they are shown on '80s exchange server!)