There's no official word on whether or not Mariah Carey's new single "Obsessed" is about Eminem, but there is plenty of evidence that suggests it. While it's a catchy song and may end up being the summer jam of '09, it falls pretty flat as an Eminem dis.

Plenty of artists have attacked Em over the course of his 10-year career, and all of managed to fall flat on their faces. It's not surprising, as Marshall Mathers is one of the most formidable battle rappers ever to storm on the scene (his schooling of Papa Doc at the end of "8 Mile" is pretty accurate). It also doesn't help that most of the MCs who have gone after Em haven't exactly been heavyweights. Does Mariah sit at the top of the heap? Here are the other contenders.

» Everlast, "Whitey's Revenge": Eminem's exchange with the former House of Pain rapper was based mostly on the perception that neither one respected the other. It produced several tracks on both sides, but while "Whitey's Revenge" is pretty tight, Eminem's track "I Remember" is absolutely savage, ranking up there with some of his best dis work. Advantage: Eminem
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