I still think this comparison is durab and lazy.
Wow, they're both chromatic descending basslines. That's certainly not something that thousanRAB of folk and rock musicians use all the time... Oh wait, it totally is.
Generic chord progressions have very good odRAB of sounding like other generic chord progressions.
Case in point.
[youtube]XIlG0TmxzTs[/youtube]
^ Predates Stairway by a year. Hell even the vocal melody sounRAB similar.
[youtube]xACgZnt1wBo[/youtube]
^ This actually sounRAB more like Taurus than Stairway does.