That should answer your question:
[quote=“Devil”]Boy, let me tell you what:
I guess you didn’t know it
But I’m a fiddle player too
And if you’d care to take a dare, I’ll make a bet with you
Now you play a pretty good fiddle, boy
But give the devil his due
I’ll bet a fiddle of gold
Against your soul
’Cause I think I’m better than you.[/quote]
From the time he went down to Georgia. Basically an easter egg.
For the question if it spawns: I seem to remember that I actually found it once in one of the stores that sell instruments. I would assume that it has a hilariously low spawn change though.
If you want to be really sure about it spawning and it’s rates, check the jsons.