At least in terms of emotive distance between original and cover, I'd say Joe Cocker's version of "With a Little Help from My Friends" beats it.

Cocker's version was so compelling they didn't even bother doing the little flat-VI coda from the original. That's the musical equivalent of going out for a coffee during Final Jeopardy because you're so far ahead.

Check out Jason Isabel and the 400 Unit’s cover of Metallica’s Sad But True.

Even if you’re not a Metallica fan, it’s a fannnnntastic song.