The performance took place during a Zac Brown Band concert.
Last week, Dave Grohl , frontman of the Foo Fighters , joined the Zac Brown Band during a performance and they played a cover of Metallica .
The Zac Brown Band were performing in Atlanta, in the United States, when the vocalist surprised the audience by taking the stage, just days after Grohl performed alongside Metallica in a tribute to Chris Cornell .
Watch a fan-recorded video below.
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