Thoughts in my head

I do understand that all the cultural activities like singing and dancing develop in society gradually. But in my head it doesn't. I like to think of these activities as works of individuals.

There is a scene that plays in my head again and again, and i can't stop thinking about it. A person invents singing. The person is singing a song and rest of tribe is amazed. "why is he/she talking in that squeaky tone?"

Another scene in my head. A person starts dancing. Other people have their eyes wide open, trying to figure out if the dancer is possessed.
"uhh... What is he/ she doing?"
"Is he/she hurt? Looks like he/she's is squirming in agony."
"Kill the Demon!!!!!"

And who discovered this "walk". Sometimes i look at people walking on the road and i pause in awe, studying the way they move forward just by moving two legs to and fro. All we do is move our legs forward and backwards. How do we end up moving ahead?

I find it queer that slapping our palms against each other is a social protocol for praise. We call it clapping. It must have been used way before languages were invented.