Casting directors can smell fear, desperation, lying and newbie-ness. And one of the smelliest places on an actor’s resume is the Accents and Dialects area.
I shudder sometimes at what I see (and hear) – so let’s get that area squared away, and your resume nice and spiffy, shall we?
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Here’s the full article, called the Dialect Map of American English, on Robert Delaney’s site so you can really dig deep.
Hope this helps!