In this Sick Lick, I use a combination of the blues scale (Pentatonic flat 5) and the Diminished Scale in the key of E Minor. These two scales are, by far, my favorites. They create very aggressive sounds and are adaptable to all kinds of music. I'm incorporating the use of my left thumb to actually fret notes on the neck. Now I'm not doing this in the traditional form where we may use our thumb to play bass notes; rather, I'm bringing my thumb from around the back of the neck to fret on top of the fretboard.