Jack White and Jack Black recorded a song together.
Although Kyle Glass was there too, so technically, it was a Jack White /Tenacious D collaboration.
Black chronicled the experience in a YouTube video titled "Jack Gray". He and Kyle went to Nashville for a tour of White's Third Man Records headquarters, then they went to his house to record the track.
They weren't allowed to film in Jack White's house, but after it was over, Black said, quote, "I'm still floating, floating on Cloud 9. I think our song is the kickin' chicken too . . . it's a stone-cold jam."
There's no word if or when we'll get to hear it.
WARNING: Profanity in the video. The Jack White stuff starts at 4:17.