Originally posted by Leonel Paiz
...I know he is tuned to open G but when I play along with him it sounds totally different??

I play it with my acoustic 12-string tunes to open E.

As for the mandolin parts, Page was a bit of a multi-tracking pioneer. He's actually a better producer than guitarist. Almost everybody who picks up a guitar takes a crack at his best licks, but there are very few who can match him in the control room!