Hey guys, I think the game lacks a fiddle. It is one of basic instruments of the time and we dont have one since release.
Also check 2 links to see how it can look and sound:
This one is a cover and sounds great with fiddle:
This one shows how it could possibly look:
https://www.artstation.com/artwork/2AwdA
Also the fiddle was first mentioned in the trailer and no signs of it ever since!