Guitarhacker
Regarding the Spirit/Zep thing..... I believe I recalled hearing that Spirit was the opening act for Zep before Stairway was "written" by the boys of Zep. Of course that negates Page and Plant's assertion that they never heard that lick before.
Read the same thing several times about 'Hotel California' and Jethro Tull's 'We Used To Know', citing that The Eagles supported Tull when they were playing that song in the set and stole the chord sequence.
Doesn't quite add up though, 'cos the Hotel California progression was written by Don Felder who wasn't in The Eagles at the time.