I suppose it's my turn.
At #3 I take....
Wow, this is tough. It would have been hard to take this over the first two choices, but I take...
Jeff Buckley- Hallelujah (from Grace, 1994)
--originally Leonard Cohen, Various Positions, 1984
Used to be a secret, but thanks to American idol and other shows, it no longer is. This version hit the top of the iTunes Charts in 2008 as a new generation discovered this gem. There are hundreds of versions of this song out there, but this is the one.
Here is Leonard's version live a few years back.
And Leonard talking about it's resurgence.