Green Lantern said:
Nah, I wasn't saying that they were ripping off the tunes, just that they didn't write the lyrics to several of their songs.
Album by album...
First Zeppelin album...
Babe, I'm Gonna Leave You- written by Anne Bredon
You Shook Me- written by Willie Dixon and J.B. Lenoir
Dazed and Confused- came from the song "I'm Confused" by Jake Holmes of The Yardbirds
I Can't Quit You Baby- written by Willie Dixon
Second Zeppelin album...
Whole Lotta Love- rewrite of the song "You Need Love" by Willie Dixon
Bring It On Home- similar to the song "Bring It On Back", and which Zeppelin lost a royalty lawsuit
Third Zeppelin album...
Gallows Pole- traditional folk song
Fourth Zeppelin album...
When the Levee Breaks- originally by Kansas Joe McCoy and Memphis Minnie
Physical Graffiti...
Boogie with Stu- heavily influenced by the song "Ooh, My Head" by Ritchie Valens
Coda...
We're Gonna Groove- written by Ben E. King and James Bethea
I Can't Quit You Baby- written by Willie Dixon
On the copy of Coda in the box-set of studio albums...
Travelling Riverside Blues- written by Robert Johnson
...so all together an astounding 12, out of how many songs?
Not even close to being half