Here’s an accent or dialect that fascinates me. It seems to cross regional borders, but has a certain socionomic association/connotation: blue collar, largely white, extended families, traditional values. In general, these are people who can fix your dishwasher, car, pool, roof, butcher a pig, build you a funky table, too, and probably give you something homemade and potent to sip while you enjoy it all. Proper linguistic taxonomy aside, I think of the speech as “Appalachian,” (at least if they have nice dogs
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To tie this in with the original question, I have heard this accent/dialect in Northwest Indiana where I grew up (including my grandmother, whose folks were rural Pennsylvania transplants, with some Balkan heritage, no less). I’ve heard it, with little variation in inflection,rhythm, even vocabulary, in places like Phoenix. Georgia. Texas–urban and rural. Florida. Southern Illinois and Missouri. Colorado. In Louisiana where they weren’t speaking Yat or thick Cajun (inlaws called them “cunass;” I was assured that wasn’t a huge slur, so I include it just for illustration). And so forth. The accent is endemic in the Navy, at least the folks I was around. It’s not as contagious as other Southern accents, at least for me, but can be quite melodic and hypnotic in its own right.
Merle and Darryl from Walking Dead are close to what I mean. Seems to me if you need a Southern accent for film, and the demographic is close, you could start with someone from any of those regions. It might even be easy to polish up a bit into a more refined–or at least, more specific–southern accent.
Speaking of Yat, I agree with the poster who said they want to hear this dialect more often. Dh is a 9th Ward transplant with virtually no accent, till we go down by his mamaw’s, then watch out…heck, after a week there, even I sound like Edith Bunker! :o