Funnily enough, I was trying to learn the comfortably numb solo today. Tell you what about Gilmour; speed-wise, nothing special. Composition-wise, moderately special. In terms of *phrasing*, though, he's off the hook. It's in the grasp of most intermediate guitarists to play the notes he played, but there are monster shredders who can't get anywhere near *how* he does it.