Very funny , Jack! Actually there is evidence that some early harps did have a skin soundboard ...

Anyway, regarding "typical music" I would say that hands down the most prevalent music would have been a cappella singing. People sang all the time then . It was part of their education in school and church, as well as common at home and work. And people were better at singing than we are as a result.

Of the thousands of songs recorded in several early 20th C collections that I have been listening to only a small percentage are accompanied by any instrument at all.

The human voice is cheap, portable and capable.