Answer:
changes in infrastructure
theorists believe music was an attempt at social glue, a way to bring early humans together into a close-knit community, There also was a Neanderthal Flute made of bone, Nambians used a type of violin, it was a string strung around a stick like a bow and the used another stick to make tunes with the string.
If you meant to type labels, there are three major record labels, Universal Music Group, Sony Music Entertainment, and Warner Music Group.
What are you learning about exactly so I can help
Any musical instrument which produces sound primarily by way of a vibrating streched membrane