Watch the 12/8 Slow Blues - Part 3 online guitar lesson by Jeff Scheetz from Blues Jam Survival Guide
One cool thing we can do is act like a keyboard player. OK, so that's not cool unless you have the skinny tie that looks like a little keyboard. But for our purpose, we can steal an idea from B3 players and hold down a drone or common note as we are switching chords. This gives it a really cool sustaining note feel.