I might be wrong about this, but for Lisa McCormick's beginner lesson on Blues Fingerstyle, Lesson #2 appears to have incorrect music notation based on the walk-through noted in the video for that Lesson. Instead, I think the notation should be as follows: https://www.dropbox.com/s/50z6mulj80hah28/Lesson%202%20-%2012-Bar%20Blues%20-%20Corrected.jpg