Martin Garrix and U2 debut their latest collaboration, “Fireflies,” at Tomorrowland in Belgium. Multiple outlets report that U2 guitarist The Edge joins the Dutch DJ onstage in Antwerp to premiere the new track during the festival, continuing the duo’s ongoing partnership in EDM and rock. Coverage also notes that “Fireflies” is released separately from U2’s more recent activity, including the band’s earlier single “Street Of Dreams,” which was teased with a music video shoot in Mexico City. Rolling Stone and others add that Garrix first introduced the joint track during his set earlier at Tomorrowland, and then debuted it again with The Edge onstage. Billboard and NME point to Garrix and U2’s previous collaboration, “We Are the People,” which was the official song for UEFA Euro 2020, as context for the renewed teaming. While sources differ on timing details for earlier teases, they consistently describe the same event: The Edge’s live appearance with Garrix at Tomorrowland to unveil “Fireflies,” with the single described as upcoming rather than fully released at the time of reporting.