In this Sick Lick, I'm using the A Minor blues scale. In its traditional form, we would tend to use the Flat 5 note as a passing note (to slide in and out of or bend from) to get that real bluesy sound. What I do here is, rather than using the Flat 5 (D#) as a passing note, I tend to base the scale around this note. What this does is create an extremely aggressive sound, and it makes the scale awesome to use for heavier styles of music.