Photo: Kurt Iswarienko| Martin Garrix has collaborated with U2 for the new single Fireflies. The Dutch DJ and producer premiered the uplifting, pop-leaning rock track last week during his headline set at Belgium festival Tomorrowland, which featured a surprise appearance from The Edge. Despite previously working with the 22-time Grammy-winning band, most recently producing Scars from their 'Easter Lily' EP, this is the first time all members of U2 have appeared on a Garrix track. He said: "Fireflies has a very unique mood and it’s a special song we started working on six summers ago. Let Us Know Your ThoughtsRelated News Martin Garrix Releases Ed Sheeran Collaboration Repeat It