hawk11 gave me this idea from his poll. The list contains 12 guitarists who are from the "classic" progressive rock era. Your three favs.
Steve Howe(Yes, solo)
Robert Fripp(King Crimson, Giles, Giles and Fripp, solo)
Martin Barre(Jethro Tull)
Jan Akkerman(Focus, Brainbox, solo)
David Gilmour(Pink Floyd, solo)
Steve Hackett(Genesis, solo)
Steve Hillage(Gong, Arzachel, Khan)
John McLaughlin(Miles Davis, Tony Williams Lifetime, Mahaishnu Orchestra,solo)
Pat Metheny(solo)
Allan Holdsworth(Tempest, Soft Machine, Gong, Bruford, Nucleus, UK, solo)
Steve Morse(Dixie Dregs)
Al Di Meola(Return To Forever, solo)
Steve Howe(Yes, solo)
Robert Fripp(King Crimson, Giles, Giles and Fripp, solo)
Martin Barre(Jethro Tull)
Jan Akkerman(Focus, Brainbox, solo)
David Gilmour(Pink Floyd, solo)
Steve Hackett(Genesis, solo)
Steve Hillage(Gong, Arzachel, Khan)
John McLaughlin(Miles Davis, Tony Williams Lifetime, Mahaishnu Orchestra,solo)
Pat Metheny(solo)
Allan Holdsworth(Tempest, Soft Machine, Gong, Bruford, Nucleus, UK, solo)
Steve Morse(Dixie Dregs)
Al Di Meola(Return To Forever, solo)