Amazingly hilarious. It's Jurassic Park OST. Starts off as an OST and rapidly degenerates along with the graphics.

The video is a reference to this No Man's Sky parody video: https://www.youtube.com/watch?v=RvAwB7ogkik

It's a genre of video where a shitty harmonica version is dubbed over the original theme.

I believe the jurrasic park one is the original;

https://www.youtube.com/watch?v=-w-58hQ9dLk

"They do move in herds"