The way I see it this little story portrays very well what Feelin' Bad Blues is all about. It's not a very complicated theme to play, once you get the tuning right (open D - my version is open E) technically its not very challenging to get the riffs right. Yet that's only half way through. The hard part is to get the feeling just right and make it sound sentimental like Ry does. More or less what Willie is trying to tell the young blues prodigee that the blues is not really about technical mastery, it's about getting the feeling just right. When Feelin' Bad Blues plays during the film Willie Brown says:
The blues ain't nothin' but a good man feelin' bad, thinkin' 'bout the woman he once was with...
Here's my feeble attempt to it play it:
This was not recorded on the marshall I show in the pics. I recorded a dry line-in and then added a few effects like tremolo, a very delicate delay etc. With the right set of pedals a wet recording will surely sound better.