Watch the Slow 12 Bar Variation 2 online guitar lesson by TrueFire from Play Blues Guitar 4: Rhythm Principles
Slow 12 Bar Variation 2 - Performance is a video guitar lesson presented by Corey Congilio and is sourced from Rhythm Factory: Texas Blues.
Another example with two grooves. I like these major examples. They're so simple yet it takes a lot of discretion to play them properly. We'll often want to over play in a slow blues example. Keep it simple with ideas like this one.