John Mayer is the latest male crooner to take on a Beyonce song. He performed "XO" during his April 15 concert in Australia with only a guitar and harmonica. A few days before he introduced the cover, Mayer tweeted that "XO" is "real and raw" -- and his acoustic folk rendition seems to emphasize that, plus all the über-seriousness that Mayer embeds in his music.
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