Lorde has released her new single and video, "What Was That," after days of teasers. The song was produced in collaboration with Jim-E Stack and Dan Nigro. The video features Lorde in New York City, including footage from a canceled pop-up performance in Washington Square Park. This release marks Lorde's first major release in almost four years, following her collaboration with Charli XCX. Despite a canceled event, Lorde eventually performed the song for fans who had gathered in the park.