Over The Hills And Far Away Bluegrass Style

I've heard quite a few people say this is Zeppelin's best song, and unfairly under-appreciated.
Personally I don't get it...but then I've never been a big fan.

Here's a totally different tune also called 'Over The Hills And Far Away'.
It's a traditional English folk tune, but the version I love is the one used on the excellent 'Sharpe' TV series, with words written by John Tams.
One of the few songs I'll admit gives me chills...