Watch the Tick Tock online guitar lesson by Angus Clark from Play in the Style of David Gilmour
This is in the key of F# minor and the chords move from A to F# minor (A being the relative major for all you theory buffs out there). This is all about bending in tune and phrasing to meet the chord changes. Yes, it's a basic blues lick, but the application is what makes it special. We're hitting the 3rd of the A chord and then using a pre-bend/release to get down to the root of the F# chord. The bends are slow and smooth, which is what you want to be working on here.