In celebration of Halloween this past Friday (Oct. 31), our favorite rockers, the Foo Fighters, performed in style at the historic Ryman Auditorium in Nashville, dressed as the popular hair metal band Kiss.

But that's not all! They invited Zac Brown to the stage at one point to assist them in covering one of Black Sabbath's best song, 'War Pigs.' You can watch two fan-filmed clips of the killer performance above and below. Although they've covered the song before, it's kind of even cooler to see them do it as Kiss.

The band's 26-song set included a couple of new songs from their upcoming album, 'Sonic Highways,' as well as covers of David Bowie and Queen's 'Under Pressure' and 'Stiff Competition' by the band's personal Chicago idols, Cheap Trick.

Surprisingly, however, there was not a single Kiss cover.

You Think You Know the Foo Fighters?

You Think You Know Black Sabbath?