On the first four cds which were reissued with bonus tracks there are snippets of conversation with Stevie where he talks about playing, influences, inspirations etc. I love to listen to these and hear him just pick up the guitar and go 'Oh yeah, this was a big influence on me' and play some riff straight out of his head.
I only hope somewhere there's a trunk full of unreleased stuff that will one day see the light of day....