VIDEO: Zac Brown, Foo Fighters cover Black Sabbath on Letterman

Georgia native Zac Brown joined Dave Grohl and the Foo Fighters last night on "Late Night With David Letterman" for a face-melting cover of Black Sabbath's "War Pigs." It was the first night of the Foos' week-long residency on "Late Night" to promote their new album and documentary, "Sonic Highways."

A Brown-Grohl pairing might seem perplexing, but the two have actually been working together since last year, when Grohl produced the Zac Brown Band EP "The Grohl Sessions, Vol. 1." Grohl a song from the EP, "Day for the Dead," with the band at the 2013 Country Music Association Awards.

Watch the video and let us know what you think of the results in the comments below:

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