Watch the Sixth Sense online guitar lesson by Frank Vignola from Jazz Up Your Blues
The 6th interval is a very useful interval in soloing and melody playing. Even when you are playing chords notice the sixth intervals in there. It's amazing how if you isolate those intervals that the chord information is still there and still outlines the chord you are on. During the solo there are also chords and single note lines thrown in there. The concept of playing sixths is a great technique to add to your playing!