David Gilmour is the reason why I play the guitar, so I'll go ahead and be biased about it and say that these albums up until Dark Side are all great.
Music From the Film More
Ummagumma
Atom Heart Mother
Zabriskie Point (maybe not one of the more well known ones, but still...)
Meddle
Relics (A compilation with guitar works from both Barrett and Gilmour)
Obscured by Clouds
