Far be it from me to tell people how they should perform but, speaking personally, I don't see how you can put your own interpretation on a song unless you actually work at it before you perform it in public. Unless you are performing your own material, it is the way that YOU put it across, as opposed to the millions of other performances of a song, that makes it interesting to me, as a listener. If you don't want to do that, fine, but you'll probably get a luke-warm reception.