| This was one of the few Led Zeppelin songs released as a single in the US. It made it only to #51. |
| The music was inspired by Jimmy Page's Celtic ancestry. |
| This began as an instrumental. Robert Plant came up with backing tracks and then lyrics. |
| Plant's lyrics were inspired by the J.R.R. Tolkien book The Hobbit. The title refers to the adventure The Hobbits embark on. |
| Page and Plant started writing this in 1970 at Bron-yr-Aur, the cottage in Wales they went to after a grueling US tour. It had no electricity or running water. |
