| This began life as an acoustic piece. Jimmy Page and Robert Plant started writing it in 1970 at Bron-yr-Aur, the cottage in Wales they went to after a brutal US tour. The cottage had no electricity or running water. |
| Led Zeppelin recorded this at the Houses Of The Holy sessions. They didn't use it on that album, so they remixed it for Physical Graffiti. |
| The band never played this live. |