[video=youtube;8wKU-jaus6w]http://www.youtube.com/watch?v=8wKU-jaus6w[/video]
Some of my other favs:
Me and You - she and him
Goodbye Yellow Brick Road - Elton John
Hallelujah - Jeff Buckley version (lots of debate on who sings this best, but I like this one)
We'll Meet Again - johnny cash
Lady - Regina Spektor
Could go on for days. I'll show some restraint.