The Misty Mountain Hop reference article from the English Wikipedia on 24-Apr-2004
(provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Misty Mountain Hop

For people who check facts
Misty Mountain Hop is a song from Led Zeppelin's fourth, untitled album (widely known as Four Symbols).

It mentions getting stoned in the park, and leaving to go to the Misty Mountains ("where the spirits fly"), which seems to be a reference to The Hobbit.