Song of History

The world is built upon countless divergences.
What if, back then, humanity had never come into existence?
What if, back then, humanity had never started fighting?
What if, back then, humanity had never sung songs?
"If things had turned out this way back then, the world would have changed like this."
There are countless worlds that might have come to be, depending on the divergences.
Yet, because of the chosen divergence, there is only one world that actually exists.
This song is sung by the last remaining human at the end of countless divergences.