Perhaps, Charley, it was humans mimicking the sounds of animals and birds that set man on the road to music. I imagine two Cro Magnon folks sitting in a cave around a fire might have come up with a musical paean to one of the bears or horses they drew on the cave walls. Maybe they came up with a primitive dirge when one of them passed on. The first time it became a shared experience set to some sort of tune probably qualifies as folk song. And then, there were instruments. Who first came up with that?