Love JT ! As a musician he's a great inspiration. I saw the special last night as well--top notch. Great to see the likes of Sting, Taj Mahal, Alison Krauss and Springsteen paying tribute.
Not only is he a great artist but a class act of a human being as well.
I believe the "garage" video may have been his Squibbnocket special which was filmed in a barn on Martha's Vinyard. It's just been released on DVD. (Was produced @ 1992 but until now on available on VHS.)