If this recurring question isn't dealt with in the FAQ, it should be. Of course the answer (what is right) is not an easy one but at least the process for submitting "corrections" or "varients" could be clarified. I personally like to see "extra" verses and "variations" of verses; it's more like what happens when real people learn songs from one another. And the real test (other than historians) for any "change" is whether others adopt it and pass it on.