Watch the G Man online guitar lesson by Jeff McErlain from Essentials: Solo Electric Blues
G Man, like the title suggests, is in open G tuning, sometimes called "Spanish Tuning". We are tuning the guitar to the notes of a G chord. From low to high our notes are DGDGBD, a G chord is spelled GBD. Open tunings were very common in Delta blues because it facilitates slide playing, and it gives some nice open string options that are not available in standard tuning. But I think mainly, open tunings have a defining sound of their own. Once you become familiar with this tuning, when you hear it, you will know it right away. I was amazed to discover how many Rolling Stones tunes use open G tuning. Honky Tonk Woman, Brown Sugar, Start Me Up, Can't You Hear Me Knockin', well basically most of the late 60's and on are in open G. For years I couldn't figure out what Keith was doing on those videos as none of it made sense to me. Until one day I was talking to my doctor who was a guitar hobbyist and Stones nut and he asked me if I ever mess around in open G like Keith, I was a changed man.