Difference between a band like Van Halen and Zeppelin is, Van Halen actually credited the original artist when they did a cover.
And I don't think too many of the artists VH covered had a problem with it.....Ray Davies probably laughed all the way to the bank, since VH's first album with that song on it sold more than all the Kinks albums combined.
I love some Zeppelin, but they flat-out stole.
Yeah, I really don't care too much about it. I have all of the originals of the music they used, and 9/10 times it's god awful. They took these songs and turned them into something cool. Also a lot of it was (and still is) public domain. Howard Stern had a discussion about this some time ago. it's available here:
http://www.dogmaticblog.com/2007/06/28/howard-stern-exposes-led-zeppelin-as-a-farce/
BTW- Here's a quick list of some of thier "lifted" material (incomplete)
Little Richard's Long Tall Sally - improvised drum track in Rock n Roll
Robert Johnson's Travelling Riverside Blues - Same title (also an improvised session)
Bukka White's Shake Em On Down - Hats of to Roy Harper
Bert Jansch's Blackwaterside - Black Mountain Side (actually, this was a traditional folk song that goes back to at least the 30's, so Bert took it as well)
John Renbourn - Nobody's Fault but Mine - Same title. This is an example where the orginal actually sounds pretty good
Spirit's Taurus - The intro to Stairway to Heaven. The rest of the song is original.
Muddy Waters' You Need Love - lyrics used to Whole Lotta Love. The music is original.
Howlin Wolf - Killin' Floor - Lyrics and parts of music used in Lemon Song.
Blind Willie Johnson - In My Time of Dying - Same title. This song was public domain and remade by dozens of blues artists.
Davey Graham - She Moved Through the Fair - White Summer (this was often paired with Black Mountain Side during live performances)
Joan Baez - Babe I'm Going to Leave You - Same title. Joan's version sounds like someone killing a cat with a power drill while a flamenco guitarist is playing in the background. The source of this song is listed as "traditional".
Owen Hand - She Likes It - Music used for Poor Tom
Otis Rush - I Can't Quit You Babe - Same title.
15th Century Folk Song - Gallows Pole - A heavy version of a song that was played everywhere on the countryside of England.
There are a few others, but please look up the originals on Youtube and you'll see what I'm talking about.