We Must Do A scientific study

There is something truly strange to this tune: https://www.youtube.com/watch?v=A21jOLmhGDM&lc=z22xclzazrzfjn1qu04t1aokgsyodreqzcrxebso4uxirk0h00410.1517060663441558 . So many people from various world places seem to agree that this tune makes them feel nostalgic; what's the link?!