Watch the R&B online guitar lesson by Brad Carlton from Groove Builder
This track is based on a typical R&B sixteenth note style groove. The secret is in what you don't play. Section A is a I, iii, IV, iv progression in C. Section B uses other diatonic chords in the key of C.
You've heard me say many times that "less is more" when it comes to soloing and rhythm playing. This groove is a perfect example of that principle.