When was music created and how was it formed

This is a good place to start: Music - Wikipedia, the free encyclopedia

Probably begun as simple vocalizations (moans, primal screams, etc.). The first instruments were probably percussive. From there, a variety of instruments were invented to mimmic the human voice; later those instruments became the source as well as tools of inspiration.

That's it in a nutshell, but the wikipedia link probably will give you detailed info.