There is supposed to be a 'parallax' phenomenon when it comes to accents. If you take your own pronunciation in a direct line towards someone's accent, they don't tend to notice the deceit, while someone from another region will. So the theory goes that if I attempt a 'Bratfud' accent in Heckmondwike the local lad will notice I'm a cummerin but not that I'm faking, while the Cornishman who overhears will pee himself laughing. This may be rubbish, but I have noted occasions where it's held good - specially working with actors. So perhaps singing in a fake accent is risky when you don't know where the audients hail from.

Tom

(yes - impossible to do Rocky Road in anything other than Irish, which is why I don't sing it)!