All of this musical sophistication couldn't have occurred at once. Certain things must have happened first, then others, then others. Early Homos sapiens probably didn't have a concept of time beyond the sun setting and rising. Phases of the moon, too. This is a total aside, but I wonder what was inherited from the Neanderthals. Apparently they made art and buried their people.
I don't think Einstein every speculated on how people experience time in relative time frames. It seemed to me that the twin going nearly the speed of light would experience relative time the same as the twin "standing still." A concept that nobody has ever explained to my satisfaction. How can it be that centrifugal force works whether we're on a space ship traveling 60,000 mph relative to the earth or resting on the earth?
Below I will post a youtube of one of my favorite female singers, Tracy Thorne of "Everything but the Girl." In the jazz forum we were talking about Billie Holiday having a limited voice but tremendous depth of emotion. I am not comparing Tracy Thorne with Billy Holiday, exceept she also has a somewhat limited voice with not a lot of range, yet she hits me emotionally as deeply as any other singer. Her husband Ben Watt lays down the background.