I was reading something a while back where a magazine was interviewing two guitarists (Yngwie Malmsteen and another guitarist I can't remember)and asked them, if you could have played one note from any song what would it be. The guitarist I can't remember said a specific note from a Hendrix song and Yngwie copied his answer and said the same note from the same song.
So what I am asking is what would your choice be? Mine is gonna be the whammy bar harmonic at 6:40 in Cemetary Gates by Pantera.