Watch the Slick Lick online guitar lesson by Jeff McErlain from Solo Factory: Chicago Blues
This is one of the more complicated licks in this course as it is derived from an E Mixolydian scale. The mixolydian scale is the the mode used over a dominant 7th chord. It's formula is R23456b7. A dominant 7th chord in R35b7, as you can see we have a dom7 chord in the scale. The other main move in this lick is that I am entering the 3rd from a half step below. This is standard fare in the blues and should be given great attention!