Oliver Heldens offers glimpse of Knife Party collaboration at Tomorrowland Oliver Heldens played out his elusive collaboration with Knife Party during his Tomorrowland set, which was first revealed in 2015. Related Posts: Tomorrowland unveils 2019 roster of stage hosts, featuring Carl Cox, Dirtybird, Charlotte de Witte, and more Armin Van Buuren drops another crowd pleaser alongside Dimitri Vegas & Like Mike, W&W
