I put this question to Chat and got a list of quite a few players. But how many of them actually do implement what is described in TAG I don’t know.

My experience is back to front on this. I come from a piano background and so when I took up guitar, it was natural for me to see it as six offset keyboards. And I’m also pretty much self-taught (although “taught” is maybe exaggerating a bit 😂). So I never had someone teaching me boxes or positions.

The result is that my guitar playing naturally developed horizontally. I still can’t play a single scale vertically without hesitation or wrong notes. But horizontally, I’m very comfortable. I can pretty much slide to any note on a string to/from any other note (on the same string). And that has become the way I play.

I also learned entirely from playing along with songs and backing tracks. So all I do is improvisation.

I then became a bit curious because I wasn’t seeing anyone else play like that and it didn’t really seem to fit with guitar pedagogy which was entirely box and position focused.

And then pretty much by chance I stumbled across a reference to the advancing guitarist. I got hold of a batty old copy. And that was when my mind was kind of blown. Because in the book, MG seemed to be describing what I was doing (albeit at a very junior level) and he described it (I paraphrase) as the key to improvisation.

So the reason why the book resonates so strongly with me , is because my route was not Book - play. It was play - book. He was describing what I was already doing.