Had to do it. Sorry. (I searched and we have some cover sing threads but not one for teh bestest!)
What are your favorite cover songs?
I can't fault Johnny Cash's "Hurt" even though I like the original better.
I really dig "Wonderwall" by Ryan Adams.
"Lake of Fire" by Nirvana is another one that stands out for me.
"Hallelujah" by Jeff Buckley
There is lots of material to choose from here people.