@tablejockey I know that Ralph wasn't playing the guitar. I was just referring to the character he played in the movie. Ralph did do a good job considering the short time he had to learn the air guitar parts for the movie.
Your link to Arlen Roth's website was very interesting. I've got a cd or two of his around here somewhere and I actually saw Son Thomas play at The Tucson Blues Festival some years ago. He was great. The power, not volume, power, coming off that stage produced by one man with an acoustic guitar was incredible.