Watch the Theme Repeater online guitar lesson by Neil Zaza from 50 Melodic Rock Licks You MUST Know
This lick examines taking a simple motif and applying it over the backing chords. When you have something good to say, say it again and again. Building themes and melodic content is about using various compositional tools. A very powerful one is the technique of using a repetitive theme and changing the harmonic content of it to reflect the chord changes underneath. Watch your fingering in this one and I recommend an alternate picking stroke for best results.