The most moving 20 seconds of guitar ever are Hank Marvin, live at Cardiff, growling up the Fender strat keyboard, culminating in those glorious ringing high thirds.
Again, The Shadows, Turn Around And Touch Me - the guitars were tuned a tone higher than usual for this, it has one of the purest notes ever recorded, on the very top fret of the keyboard, and right up there too is arguably THE guitar note of all time, Mark Knopfler in Tunnel of Love.
I love Slashs guitar solo in November Rain and also the opening to Knights of Cydonia by Muse which reminds me of Telstar. Could be because Matt Bellamys dad was in the Tornados.