Misty Mountain Hop - Live: O2 Arena, London - December 10, 2007

This is about a "love-in" near London that was broken up by the police. Robert Plant explained: "It's about a bunch of hippies getting busted, about the problems you can come across when you have a simple walk in the park on a nice sunny afternoon. In England it's understandable, because wherever you go to enjoy yourself, 'Big Brother' is not far behind."

The Misty Mountains are in Wales. They are referred to in J.R.R. Tolkien's The Return Of The King. Plant is a big fan of Tolkien and used references to the Lord Of The Rings series from time to time.

Led Zeppelin wrote and recorded this at Headley Grange, a mansion with a recording studio in Hampshire, England, where the band sometimes lived. Jimmy Page wrote the song one night while the rest of the band was sleeping.