Musician Slash performs on stage at the 10th annual MusiCares MAP Fund Benefit Concert at Club Nokia on Monday, May 12, 2014 in Los Angeles.

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Musician Slash performs on stage at the 10th annual MusiCares MAP Fund Benefit Concert at Club Nokia on Monday, May 12, 2014 in Los Angeles. (AP)

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Singer Ozzy Osbourne and guitarist Slash perform on stage at the 10th annual MusiCares MAP Fund Benefit Concert at Club Nokia on Monday, May 12, 2014 in Los Angeles. (AP)

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Singer Ozzy Osbourne and guitarist Slash perform on stage at the 10th annual MusiCares MAP Fund Benefit Concert at Club Nokia on Monday, May 12, 2014 in Los Angeles. (AP)

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Musician Ozzy Osbourne performs onstage at the 10th annual MusiCares MAP Fund Benefit Concert at Club Nokia on May 12, 2014 in Los Angeles, California. (AFP)

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Musician Ozzy Osbourne performs onstage at the 10th annual MusiCares MAP Fund Benefit Concert at Club Nokia on May 12, 2014 in Los Angeles, California. (AFP)

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Musician Lars Ulrich of Metallica performs onstage at the 10th annual MusiCares MAP Fund Benefit Concert at Club Nokia on May 12, 2014 in Los Angeles, California. (AFP)

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Musician Kirk Hammett of Metallica performs onstage at the 10th annual MusiCares MAP Fund Benefit Concert at Club Nokia on May 12, 2014 in Los Angeles, California. (AFP)

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Musician James Hetfield of Metallica performs onstage at the 10th annual MusiCares MAP Fund Benefit Concert at Club Nokia on May 12, 2014 in Los Angeles, California. (AFP)

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Musician James Hetfield of Metallica performs onstage at the 10th annual MusiCares MAP Fund Benefit Concert at Club Nokia on May 12, 2014 in Los Angeles, California. (AFP)

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Musician James Hetfield of Metallica performs on stage at the 10th annual MusiCares MAP Fund Benefit Concert at Club Nokia on Monday, May 12, 2014 in Los Angeles. (AP)

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