I found some jokes told by some Bluegrass Performers over the years.
Lester Flatt used to say of Josh Graves durring introductions, “You’ve heard of people that don’t know nothin’? Well he don’t even suspect nothin’.”
The Pinnacle Boys’ Bud Brewster used to respond to requests for songs they didn’t like or didn’t know by saying, “I’m sorry but we don’t have that one worked up. But here’s one with a lot of the same notes and we sure hope you’ll like it.”

Tom Rozum was full of lame jokes at the Lewis-Rozum shows. One example:
Why do chicken coops have two doors?
If they had four, they’d be chicken sedans…

How about this from the Country Gentlemen.
Boy, I really like this town, but I gotta tell you, last night, I didn’t get any sleep at all. There were all these girls banging on the door all night long!
It got so bad, I finally had to get up and let ’em out!

And an oldie but a goodie….what do you call a beautiful woman on the arm of a banjo player?
a tattoo

Got any others ?