And by that, I mean when did a "music shop" of sorts start making instruments and selling them to people.
I'm doing a little essay about music and class structure and I'm trying to find out when the lower classes were able to acquire instruments. Either from making them themselves or buy from those that could. And even if you can't answer the question 100%, sources that I could delve into would be awesome.
http://en.wikipedia.org/wiki/Ocarina
These were made out of clay a really long time ago. There's also good stuff under Similar instruments.
According to http://ocarinaforest.com/info/ocarina-history/ the oldest clay whistles found in Central Africa goes back more than 30,000 years.
There's this, too. http://caribem.hubpages.com/hub/Worlds-Oldest-Musical-Instruments
I think you may be barking up sort of the wrong tree with this question on instruments in regards to musical class divides! It might be more fruitful to focus on class divisions in types of instruments, say instruments that show up in folk music (flutes, tinwhistles, drums, etc) vs highly complicated and labor intensive instruments (organs, pianos). And the first and oldest instrument (the human voice) is of course available to all classes.
Class and music is one of my favorite thing though, can you tell me more about your essay?