I'm sure you already know that you can't enter an already-released song into Eurovision. So you now just need to find a song that hasn't already been released yet and you'll be closer to finding the winner.
I'd recommend some churning maidens in front of any song we choose. To keep it nationally relevant they can be stirring buckets of fish batter and have an upper lip of spunky froth from the head of local ales and be growingly obese.