Watched the 1st half of the 1st video ; quite impressive to see what they can do with just a guitar, an amp, a voice and a microphone, a drum set and a bass with its amplifier, like naked...Very interesting view of how they were at the very beginning (I guess) before fame and glory (and huge stadiums and P.A. systems). It's basically the same conditions as any band could have in a large English pub or so at the time, and we can see it's all there ; talent and invention, skill and passion, guts and charisma...
I've never been a genuine Led Zeppelin fan, but gosh, they could really do it, and they didn't cheat there !
(but I've never known that Dazed and Confused was originally a Yardbirds' thing).