Re: Stairway to Heaven turns 40....
In the 1990s I had to take a break from Zep because I had played them to death (as well as the radio stations). Now I listen in moderation, and can appreciate their music more. The last 2 minutes of Stairway is one of the best and most raucus segments of a rock song....ever.
In terms of where Stairway stacks up with the rest of their catalog, I'd put it 4th behind:
Good Times Bad Times
"Through many dangers, toils and snares..." - Amazing Grace, third verse