The easiest for this former kinda guitar player were, at that time, among these:
-Wither
-In the Presence of Enemies (the main theme "solo" in Part 1)
-Learning to Live (surprinsingly enough, all of them, which IIRC are three)
-These Walls (mmm, not really a <solo per se>, more like a melody or arrangement, but, as Sycsa says, very easy to play anyways)
-Peruvian Skies