I claim Richard Thompson as my favorite guitarist. I don't really claim him as an influence. Why? Because I never have really sat down and tried to learn his stuff.
I put on "Gimme Shelter" (Admittedly not RT) and the Watching The Dark 17-minute version of "Calvary Cross", and tried to pick 'em up.
"Calvary Cross", as a Google search for tabs will tell you, is F Am G through the verses. What the tab doesn't tell you is that, on the long version, he goes to D F#m E. As far as I can tell, he's playing in E major, or something related to E major.
Thompson is also the reason I love tremolo. Just to make this point clear, tremolo is a variation on volume, like with the Fender vibrato circuit, and vibrato is variation on pitch, like with the Fender tremolo bar. Yeah, the great Leo Fender got them reversed. That's OK, though. He invented the stuff, he didn't have to name it right.
Anyways, I've recorded something with that flavor and tremolo. Through my AX1500G, into my work laptop with Audacity.