In the middle of his set, which drew heavily from Cook’s 2024 solo album Britpop, as well as Brat and it’s completely different but also still brat, Danny Brown appeared in a red telephone ...

A. G. Cook and Danny Brown. CREDIT: Dave Benett/Getty Images for Warner Music and Sergione Infuso/Corbis via Getty Images Midway through the set, Cook surprised fans with an appearance from Brown ...