I wonder where Page got it from? I'm certain he didn't invent it. There is so much string bending goodness in that 10 years solo. It is 100 percent soul felt playing. Marc is my dog. I'm pretty sure he is a Page disciple as well.
My best guess is Motown. That's where a lot of that soulful stuff comes from. Chord melodies, etc. are all stemming from Motown/Stax type music. You can hear it in everything from BB King to Dwight Yoakam.
This is more "playing pentatonic patterns off of chord shapes" than straight pentatonic wanking, but it's pretty good. I had to learn these solos for a gig we have coming up, and I have to say they are super simply, but also very tastefully done and they sound more impressive than they really are.
It depends. Mostly on whether I can figure out what the guitarist is doing. Rick is just playing pentatonics over an F-shape chord pattern for each chord, so this one was pretty easy. But it's easy in a really cool way.
All he does is move the pattern up as the chord progression moves. So he's in 5th position for the A, and when they go to D its 10th position, and for the V chord (E) he either runs to the 12th fret or plays pentatonics in the 5th position.