Watch the Johnny's in the Ghetto online guitar lesson by Jimmy Reiter from Soul Guitar Guidebook
I love I minor - IV major grooves. Donny Hathaway's "The Ghetto" is a fantastic example, and if you're not familiar with him, do yourself a favor and check out his albums Live and Everything Is Everything. They are milestones in music history as far as I'm concerned and feature some stellar guitar playing by guys like Cornell Dupree and Phil Upchurch.
In this lesson, you can learn what blues/funk guitar master Johnny "Guitar" Watson might have played in a song like this.