Staples Center

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Bruno Mars speaks on stage at the 56th annual Grammy Awards at Staples Center on Sunday, Jan. 26, 2014, in Los Angeles. (Photo by Matt Sayles/Invision/AP)

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Bruno Mars accepts the award for best pop vocal album for "Unorthodox Jukebox" at the 56th annual Grammy Awards at Staples Center on Sunday, Jan. 26, 2014, in Los Angeles. (Photo by Matt Sayles/Invision/AP)

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Bruno Mars accepts the award for best pop vocal album for "Unorthodox Jukebox" at the 56th annual Grammy Awards at Staples Center on Sunday, Jan. 26, 2014, in Los Angeles. (Photo by Matt Sayles/Invision/AP)

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Tony Iommi, from left, Ozzy Osbourne and Geezer Butler speak on stage at the 56th annual Grammy Awards at Staples Center on Sunday, Jan. 26, 2014, in Los Angeles. (Photo by Matt Sayles/Invision/AP)

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Paul McCartney, left, and Dave Grohl, accept the award for best rock song for “Cut Me Some Slack" at the 56th annual Grammy Awards at Staples Center on Sunday, Jan. 26, 2014, in Los Angeles. (Photo by Matt Sayles/Invision/AP)

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Jamie Foxx, left, presents Jay-Z with the award for best rap/sung collaboration at the 56th annual Grammy Awards at Staples Center on Sunday, Jan. 26, 2014, in Los Angeles. (Photo by Matt Sayles/Invision/AP)

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Beyonce, foreground, and Jay-Z "Drunk in Love" at the 56th annual Grammy Awards at Staples Center on Sunday, Jan. 26, 2014, in Los Angeles. (Photo by Matt Sayles/Invision/AP)

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Beyonce, left, and Jay-Z perform "Drunk in Love" at the 56th annual Grammy Awards at Staples Center on Sunday, Jan. 26, 2014, in Los Angeles. (Photo by Matt Sayles/Invision/AP)