Beyonce Wows Jay-Z in 'American Idol' Rehearsal

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"Oh man," Jay-Z, the cam holder, yells out after listening to his wife, Beyoncé, rehearse her single, "1 + 1."

Beyonce Performs New Song, '1 + 1': Watch

Life + Times, Jay-Z's site, posted a behind-the-scenes clip of Bey' showcasing her pipes before performing the opening track of "4" on the "American Idol" Season 10 finale.

In the same post, SC wrote, "Sometimes you need perspective. You've been right in front of greatness so often that you need to step back and see it again for the first time. This is the dressing room rehearsal for American Idol. NO MICROPHONE. No effects."

Be blown away.

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