In bar 1, the 12-bar blues form begins, and over C7 in this example I start with a B.B. King-style lick that’s based on a combination of C major pentatonic (C, D, E, G, A) and C minor pentatonic ...

Figure 1 illustrates the 12-bar blues form in E, starting with the stock root-5th, root-6th boogie vamp pattern, moving from E5 (E and B) to E6 (E and C#) on each beat through bars 1-3.