From his 1994 Let Go, please enjoy unclassifiable American guitarist John Fahey and his breathtaking overdubbed solo version of "Layla."
Fahey died, one assumes of a surfeit of the blues, in 2001. I only saw him play once, at some point in the mid-80s, when I lived around the corner from Folk City; he was a little drunk, I think, but very funny between songs. Frankly, I didn't think he was that hot musically, though; I remember thinking "That's what people have been raving about for all these years?" In retrospect, of course, I suspect he was just having an off night, at least if this "Layla" is any indication.
[h/t Steve Schwartz]