"The Idiot Kings" by Soulcoughing is great too.
"No Quarter" - Tool. I actually like this better then the original.
"No Woman No Cry" - Bob Marley 'Good friends we've had, or good friends we've lost, along the way' Gets me every time.
"Face of Appalachia" - John Sebastian. Formerly of the Lovin Spoonful, great song about the AT.