This was recorded on April 4, 1968 at one of the last studio sessions for The Yardbirds, under the title "Knowing That I'm Losing You." This first version performed by The Yardbirds, featured music almost identical to "Tangerine" by Led Zeppelin, but with different lyrics (vocals by Keith Relf), and was never officially released. It was supposed to be included on the Cumular Limit
compilation (which was released in 2000), together with other materials from the same sessions, but interestingly enough, Page vetoed the release of the song. Since then, the version from The Yardbirds has leaked onto the internet, and Page has been accused of ripping off a Yardbirds composition, simply changing the majority of the lyrics (probably initially written by Keith Relf) in order to avoid any problem with the other members of his previous group. This would explain his veto against the release of the original song. It is not easy to ascertain the above, as the remaining members of The Yardbirds haven't spoken about the subject so far.