I posted that Buudy Guy clip before I read NDs post about what songs Led Zep have glossed over as their own, rendering my post kind of pointless haha. Interesting stuff, as I knew they credited some songs as covers but didn't know so many of their originals were so borrowed as well. Still a great band obviously. It's a shame it often takes a white artist like Page, Elvis, Eminem or whoever to take a black music form and reap the super-massive bucks.
Also interesting in the context of this thread how out of the greats; Crosby, Sinatra, Elvis, The Beatles, Michael Jackson, Jacko is the only one who is/was black.