Not just a song that can be found in the archives, but one that almost everyone can hum, even today.
(Somebody asked what was meant by "today's...." Throw whatever you want out, somebody tossed out "Love me tender" as being a tune from in the 1860s.)
Oh this is easy, but you may not thank me for it. Hum, whistle or sing, anyone near you will do the same after a minute or so. It's timeless and it even has it's own website
I give you Lipps Inc. - Funky Town