Watch the How Blue Are You? online guitar lesson by TrueFire from Blues Guitar Greatest Hits - Vol. 4
How Blue Are You? is a video guitar lesson presented by Jeff McErlain and is sourced from 30 Sweet Blues Licks You MUST Know
Here is the intro to BB Kings tune "How Blue Can You Get". Man, this one is awesome. I learned it fairly recently and was totally amazed at what was going on harmonically and nuance wise. His use of dynamics and bends on this lick was really fun to explore. Please check out the original version of this lick to hear the master at work.
Basically, the lick is just made up of a D and G major triad if you break it down. If we look carefully, we see that he's playing the D triad on the D7 chord and the G triad on the G7 chord. Imagine that?! Please see my Chord Tone Soloing
course at TrueFire for more info on that concept!