In Disney’s “The Princess and the Frog,” the firefly Ray says he has a Cajun accent because he was “born and bred in the bayou!” While that may be true for Ray, the voice actor portraying him, Jim ...

When performed well, the lilting brogue of the Irish accent sounds mellifluous and musical. When performed poorly, it can sound campy—even egregious. But what makes one Irish accent good and another ...