There was an article in Sunday's New York Times about Blues artists. You should all read it. Each and everyone of those men not only sing the Blues, they ARE the Blues. The Blues are personal expression. They are a reflection of personal experience.
Blues is a sort of religion.
Like Gospel singers, Blues artists yearn for a better time, a more perfect place. As Mr. Johnson said, it is a fever that can be caught. What they sing about is not what is important to someone else, but what is important to themselves. It is another, someone in charge, who decides what and how the group will express. JumpStreet continues an old tradition of what began as African American slave music.