One of the best tracks I have "discovered" on the interweb is a live, acoustic version of Tom Petty's "I Won't Back Down" by Pearl Jam. Quickie research tells me the performance took place at "Gorge '06" -- somehow, 2006 shouldn't feel so long ago but it does. The song in the original is great (the delivery of the chorus, especially), but I love hearing Eddie Vedder's lone voice rising up quietly with the faintest guitar accompaniment -- love it.
Lyrically, I believe it was intended as song about political/social adversity. That's fine, but I take my personal anthems where I can grab them.
LiveJournal does not permit me to embed my actual track, <"http://www.youtube.com/watch?v=3wkxAm