Watch the Loving You: Ex. 2b online guitar lesson by Andy Aledort from Kings of Rock & Roll Vol. 7: Jimmy Page
This excerpt represents the next eight bars of the 12-bar blues progression, and begins with a very slick riff based on a scale that can be interpreted as either F Dorian (F G Ab Bb C D Eb) or C Aeolian (C D Eb F G Ab Bb); notice that both scales are made up of the same notes but start at a different point in the series. One of Jimmy Page's great innovations was to rely heavily on a modal approach, as this solo demonstrates.