The Foo Fighters and Singer Zac Brown Cover ‘War Pigs’ by Black Sabbath on the ‘Late Show With David Leterman’

Zac Brown, the titular singer of The Zac Brown Band joined The Foo Fighters for a shredding cover of the Black Sabbath classic “War Pigs” on Late Show. Host David Letterman was suitably impressed.

Black Sabbath. Zac Brown. Foo Fighters. I don’t know — what do you kids want from me?!