Now some people don't understand. They think a blues player has to be worried, troubled to sing the blues. That's wrong. I'll put it this way; there's a doctor, he has medicine. He's never, sick, he ain't sick, but he has stuff for the sick people. So the blues player, he ain't worried and bothered, but he's got something for the worried people. Doctor . . . you can see his medicine, you can see his patient. Blues . . . you can't see the music you can't see the patient because it's soul. So I works on the soul, and the doctor works on the body - Roosevelt Sykes, spoken on Smithsonian/Folkways Classic Blues anthology