Fiona Apple with her version of Elvis Costello's "I Want You". This is from the Decades Rock Live! show, which pairs up "classic" and contemporary artists. Fiona completely owns this song, she burns and smolders, singing it like some fucking psycho stalker ex girlfriend. Reminds me of some girls I used to know. In any case, I think it's an excellent rendition. You can also check out a video here, if you're so inclined.
Fiona Apple > I Want You