Watch the I Can See online guitar lesson by Jeff McErlain from 50 Blues Rock Guitar Licks You MUST Know
Here is one of my favorite licks, it is a mix of both major and minor pentatonic scales with an added blue note. Let's take a closer look, the scale formula would be R, 2, b3, 3, 4, b5, 5, 6, b7. Wow, we have a series of chromatic notes from the 2nd through the 5th. That is a lot of information and some really cool sounding stuff. The scale may sound strange playing it by itself but if you learn how to manage those chromatic notes you will be quite happy. For us blues rockers I would say this is the scale you should spend much of your time on.