Oh, you didn't come off as sarcastic. Don't worry about that, that's my department.
Hehe.
Examples... well, there's the obvious tribute bands. I saw Abbey Road and they did the harmonies very well, especially those on Paperback Writer. My only complaint is that the accents were off.
Other than that, I tend to keep company with a lot of professional musicians (not like, world-famous of anything, but it is how they make their living) and we have the occasional jam session. They seem to pull off the Beatles harmonies quite well.