I'm with Will, too...but I DO think that *some* songs are hard to sing properly wthout reference to the accent or dialect they were originally performed in. I don't mind whether an Irish song is sung in an English or Irish accent, but can perfectly well understand that the *structure* of some Irish songs almost automatically generates a "lilt" in the singer, wherever (s)he's from. In the same way, northern English songs often *rely* on hard "a" sounds, peculiar pronunciation of some words and dropped "hs" to "sound right". Just 2 "frinstances" of many possible.