The same Led Zeppelin that borrowed all those American blues and country riffs throughout their career?

If you educate yourself on American music from the 20s-50s you'll realize the true extent of the influence on the British music of the 60s and 70s. It's a lot more than Rocky Raccoon but if you're ignorant of country music you're not going to hear the guitar licks, drum patterns and vocal inflections that show up in many of the recordings by the Beatles.

There's no shortage of literature on these influences so how about we just leave any additional education on the matter to personal study, eh?

> The same Led Zeppelin that borrowed all those American blues and country riffs throughout their career?

I see that easily, it's the folk influence I have a (harder) time with.

Tangerine? Bron-yr-Aur Stomp? Stairway? They had Sandy "Fairport Convention" Denny as a guest singer.

Led Zep are absolutely in the English folk tradition – distinct but related to the American scene – as well as the blues one.