The sound of a cave's echo when singing would have sounded good, and percussion instruments are good to help a few singers sing to the same beat. Art is another form of communication, They would have sang about things that they identified with, but theres something about people that makes them want to keep a record, to show others what has been going on. Stories can change, but art can be permanent. A way to show the children and descendants how they lived, and the cave paintings could showing how, and what to hunt.

Great clip!