"If there's a bustle in your hedgrow, dont be alarmed now

[Rev. Rye]

Fun fact: I recently wrote an article about the new controversy about that song. Allegedly, a song by Spirit called "Taurus." Apparently, Zep's first American tour was supporting Spirit, and "Taurus" always brought down the house, and apparently, there's a part of the song that sounds almost exactly like the intro to "Stairway to Heaven."
https://www.youtube.com/watch?v=xd8AVbwB_6E

However, I found a cover of "Cry Me a River", by Davy Graham, that sounds more like "Stairway to Heaven" than "Cry Me a River." And it was recorded more than a decade before Led Zeppelin IV was released.
Compare:
Davy Graham's "Cry Me a River."
https://www.youtube.com/watch?v=tWeejHJxGjs

"Stairway."
https://www.youtube.com/watch?v=8pPvNqOb6RA

And, for control, Julie London's "Cry Me a River."
https://www.youtube.com/watch?v=SwheXIa8Cl0

And, what's more, Page explicitly derived one of his early instrumental works, "White Summer," from Davy Graham's version of "She Moved Through the Fair."
https://www.youtube.com/watch?v=76Yvw_ZztQk
https://www.youtube.com/watch?v=vTvtZRYVeX8

Conclusion: if Jimmy Page was plagiarizing from anyone, it was Davy Graham. Really, at its heart, Zep was always a blues band, and bluesmen tend to do that sort of thing.