Awesome cover of our favourite Black Sabbath song “WAR PIG” by Foo Fighters and Zac Brown!

Dave Grohl also spared a few minutes for an interview with Letterman, speaking about Foo Fighters’ new album, ‘Sonic Highways’ and Grohl’s daughter’s affinity for Amy Winehouse.  Check out both clips below.

Read More: Foo Fighters Cover Black Sabbath’s ‘War Pigs’ on Letterman | http://loudwire.com/foo-fighters-zac-brown-cover-black-sabbath-war-pigs-late-show-with-david-letterman/?trackback=tsmclip