Pink Floyd - Comfortable Numb - You hear most of what 80's hard rock and particularly the solos would sound like, ie. Guns and Roses in particular milked the heck out of that tune.
Metallica - Ride The Lightening - First guitar solo I sat down with a guitar teacher and tried to listen (5th or 6th grade if I remember right) - loved the melodic qualities of it.
Jane's Addiction - Ocean Size - both solos are beautiful but I especially like what comes in after the initial drop where they go right back to the accoustic guitar for a few bars to kick the first solo in. It doesn't sound insanely hard to do but again, melodically, it's insanely good. Like Comfortably Numb's first solo, like solos in general, I love the really jaded stuff where you could almost imagine Lucifer jamming out with his wings burned off (that's actually a vibe Dave Navarro could deliver on a regular basis).
Jane's Addiction - Three Days - again, super-evocative, bring you to tears thinking about society, God, network effects, sacred imagery, and all of that and Dave's solo here again built that vibe up where... it kinda gives me Burning Man vibes or like Emile Hirsch in Into The Wild when he's visiting the old hippy village in the southwest, it evokes that kind of thing for me.
Suicidal Tendencies - You Can't Bring Me Down - Rocky George shredding solidly. Not a lot else needs to be said.
Faith No More - Epic - Probably the most 'mersh' tune FNM did, not even all that complex a solo, just super evocative and really well chosen notes and direction.
There are probably a lot of others I could try bringing up but that's probably enough for now.
_________________
The loneliest part of life: it's not just that no one is on your cloud, few can even see your cloud.