This week, the puckish, conceptual British electronic duo the KLF reunited after a 23-year absence to throw Liverpool: Welcome To The Dark Ages, a three-day festival featuring events like “Why Did The K Foundation Burn A Million Quid?,” “2023: What The Fuuk Is Going On?,” and “The Rites of MuMufication.” On the final day, as Pitchfork reports, Jarvis Cocker came onstage to perform a cover of their 1991 hit “Justified & Ancient,” and you can watch his rendition below.