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Foo Fighters and Zak Brown cover Black Sabbath’s “War Pigs”

Foo Fighters and Zak Brown shred Black Sabbath’s “War Pigs” on Letterman.

Foo Fighters and Zak Brown shred Black Sabbath’s “War Pigs” on Letterman.

In support of their highly-anticipated album, Sonic Highways, and accompanying HBO mini-series of the same name, Foo Fighters will serve as the musical guest every night this week on the Late Show with David Letterman. 

Dave Grohl & co. kicked off their five-night residency with a fiery performance of Black Sabbath’s “War Pigs”, which featured a cameo from country rocker Zac Brown.