As a guitar player, you can gravitate to the blues because you can play it easily. It's not a style that's difficult to pick up. It's purely emotive and dead easy to get a start with. ↗
I have a feeling he felt Jon Voight had run away with the film, which he didn't, though he was brilliant in it, in a much less easy part. I just don't know what had got into him, but something had. ↗