Music Mondays - Best Covers Ever

For no real reason other than it was an idea that popped into my head, I'll be featuring my favorite cover songs. I can't really define exact criteria but if an artist takes a song and makes it their own, it qualifies.

One of the first that jumps out to me is Israel Kamakawiwo'ole's version of "Over the Rainbow". You've probably heard it featured in a TV show or movie. I can't remember exactly the first time I heard it (Scrubs maybe?). But it's such a beautiful rendition of the classic Wizard of Oz track. 
The video wasn't what I expected but clearly celebrates the life of the late artist.