For the record, if you google “scary redneck music” Dueling Banjos is the first hit.
No, “What Child Is This?”
God Bless the USA?
It’s A Small World.
May not be redneck but it’s scary as hell.
Indeed. Steve Martin, who is a completely self-taught banjo virtuoso, pointed this out in one of his classic bits. He says how ‘happy’ a banjo sounds, when you hear it you know every thing’s gonna be ok. How, “You can’t play a banjo and sing, ‘Oh death, and grief, and sorrow, and murder…’” 
It’s called Honky Tonk Badonkadonk
Pretty sure it was that dueling something number. I’ll see if I can google it…
Here we go-
Ten Duel Commandments from Hamilton
Fighting Flutes?
Arguing acoustic guitars?
Scrapping saxophones?
Battling bongos?
Ornery ocarinas?
Angry accordions?
Damn what the f is it?
Even the names “Lester Flatt” and “Earl Scruggs” just sound like the kind of people who play banjo music.
Free Bird
Banjo? Hell, that guy made the fucking slide whistle sound dark!
Seriously, though, that’s an awesome video.
edit: never mind!