one chord vamp
https://www.youtube.com/watch?v=eKNyQDGFGqg
12 bar blues backing
https://www.youtube.com/watch?v=V6aZZFnZUVk

one chord vamp
https://www.youtube.com/watch?v=eKNyQDGFGqg
12 bar blues backing
https://www.youtube.com/watch?v=V6aZZFnZUVk