To me this is no different than when one is singing a song of the sea and one affects the slang and the idioms of the sailor. In Irish music, could you imagine singing "The Finding of Moses" without taking on the appropriate Dublin accent? It seems to me that if one is compelled to sing a song that requires an accent, then one should commit themselves to learning to reproduce it faithfully. Imagine also trying to sing in the language of a country, such as Gaelige or French, but taking no time to learn appropriate pronounciations. I feel that if a dialect is needed for the interpretation, then one should be used. In my opinion it has to do with remaining faithful to the music. On the other hand, there are large numbers of songs that require no accent to sing well.

Mick