In my case, I have no choice - I have one of those tape-recorder sets of ears and can only sing songs the way the singer I learned them from sang them. I also have a French accent in German because my teacher did... so I sing most of my songs with a brogue, and a few with a burr, and some like other ethnicities, but at least since I have the chameleon linguist ability, if the model has an authentic accent, so do I. I couldn't sing an Irish ballad in my normal American accent if you paid me.