Beanster - I don't think it's that anyone is being touchy - I think it more that everyone just thinks a different way. I started a thread regarding Musicians vs people who play music and watched the same thing happen. I thought I'd laid out a distinction on the difference I was trying to define, but everyone seems to have a different interpretation of the term. Same thing has happened here with 'cover.' I think each person is expressing their own interpretation or viewpoint, and not really getting upset. Remember, whatever the rules you lay out to begin with, in his(her) own universe, each person is always in the right.
It's been interesting to see other people's permutations of my original thought - very insightful for me.