This video is a project called Playing for Change. The producers travel from country to country, recording each artist. The artists are not linked at the same time; they listen to what was recorded previously and add their flavor to the song. Below is a link that can explain more.
Good cause and love the older guy from New Orleans, Grandpa Elliott. I posted a YouTube clip below on David/Bob's (or whoever he goes by nowadays) thread that made him get sick in his mouth... Made my day.