Watch the Scales online guitar lesson by Jimmy Reiter from Soul Guitar Guidebook

The Mixolydian scale and the major pentatonic are typical scales used in soul and R&B music, as well as the good ol' blues scale and the minor pentatonic. Every once in a while I like to use the Fahrenheit scale, too.

OK, to be honest with you, I'm not a scales guy, but it certainly doesn't hurt to know and understand a few fundamental concepts so you can develop your own personal approach.