Classic Led Zeppelin piece by Jimmy Page. Page has explained that: Robert (Plant) and I went to Bron-Yr-Aur in 1970. We'd been working solidly right up to that point. Even recordings were done in the road. We had this time off and Robert suggested the cottage. I certainly hadn't been to that area of Wales. So we took our guitars down there and played a few bits and pieces. This wonderful countryside, panoramic views and having the guitars ... it was just an automatic thing to be playing. And we started writing. According to the guitarist, the time spent at Bron-Yr-Aur in 1970 ...was the first time I really came to know Robert [Plant]. Actually living together at Bron-Yr-Aur, as opposed to occupying nearby hotel rooms. The songs took us into areas that changed the band, and it established a standard of travelling for inspiration... which is the best thing a musician can do.