I had the same experience last night and thought how great youtube is. After viewing the clip you posted I got into some Yardbirds. I am a big Led Zeppelin fan so it was very interesting for me to see the roots of the bands creation. I also checked out some Jeff Beck with Rod Stewart. At one point Jimmy Page was considering Stewart as the front man for Zeppelin. So really, Beck and Stewart could have been the beginning of a Led Zep type blues-based superband. As it turned out, Jimmy page got the ingedients right with Bonham, Plant, John Paul Jones, and the management of Peter Grant.
Anyhoo, got some work to do today.