Generally speaking, nothing. We don't really have the best idea of music even during Ancient times. Music was a common thing to write about among the great philosophers in Greece, but many of these discussions were on the theory (and physics) of music.

We only have fragments of notated music, and despite claims that we know how it sounds, the truth is that we don't know with certainty. The Epitaph of Seikolos is generally regarded as the oldest known surviving composition, dated anywhere from 200 BC to 100 AD. Just glancing at the Wikipedia article (citing a scholarly source by Kilmer & Civil, 1986), there is evidence of music notation during Ancient Mesopotamia with the Hurrian Songs--but any transcription appears to be quite controversial (and hence why it really hasn't made any noise in the historiography of music.)

One could guess that there likely was music in prehistoric time, but if there was, it wasn't written down. In the case it was notated, we don't have the greatest idea of what it sounded like.

Hi, this question is permitted here, but you might consider x-posting this to our sister sub /r/AskAnthropology. While there are some anthropologists here, there are more there, with more specialization in earlier time periods.