Watch the Bluesgrass 2 online guitar lesson by Joe Dalton from 50 Country Guitar Licks You MUST Know
This lick is based on the major pentatonic scale. The use of the flatted third creates just enough tension to turn your ear. I always look for a good downward moving lick after playing a lick like the previous one. You can use this as a tag ending or with one of the variations you can use it to build a solo.