15 Cover Songs That Beat The Original

"They say imitation is the most sincere form of flattery, and artists aren’t shy about covering songs that they admire. Take the great Aretha Franklin with her recent cover of Adele’s “Rolling in the Deep,” or Rita Ora’s stripped down version of Beyonce’s “Drunk in Love”. Even Sia turned her superior pipes towards tunes that she wrote for artists like Ne-Yo and Britney Spears. But not all covers are sung equally, and occasionally you have that rarest of phenomenon: a cover that outdoes the original." 
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Source: http://www.vh1.com/news/53848/cover-songs-...