Joe--funny you should mention that, about "Bill Grogan's Goat" being more common in the U.S. I can't speak for the rest of the country, but at my camp in Virginia, I was nearly booed offstage several years ago for singing "Bill Grogan's Goat". Apparently "My Highland Goat" is the official version 'round those parts, and imitators were not to be tolerated.