I just taught myself the intro to Stairway to Heaven so I've been reading up about it a lot...you know if it weren't for Zeppelin's affiliation with Spirit I would have said it was a coincidence and just a common use of the chromatic scale, I'm sure it's in some classical music piece somewhere. But since Zeppelin opened for Spirit, what can I say? They've been robbed of greatness, haha!

But Stairway is still an EPIC song, can't deny that. Great lyrics and guitar solo.