Watch the G Slow Blues: 2nd Chorus online guitar lesson by Robben Ford from Riff Revolution
We're now in the last four bars of this chorus, going to the V chord, playing right out of the key of D. Generally, when playing the blues, it's almost unadvisable to play right out of the key of D. Because over the V chord, there's the danger of sounding like you've left the mode that you're in. It sticks out and is obvious that you're playing in a different key. So when I do this, it's deliberate. It's meant to sound like a change. It's something that has an effect, and changes things in a person's ear whether they know it or not.