Avicii made his Tomorrowland debut in 2011 with a set that included a then-unreleased track called “Levels.” By the time he returned to the Belgian festival the following year, plenty had changed. “Levels” had been a hit across the world and the Swede born Tim Bergling was given Friday night’s headline slot on the MainStage. Beginning with a scintillating mashup of The Who’s “Baba O’Riley,” Deniz Koyu’s “Bong,” and his own “Fade into Darkness,” he delivered a set that features many of his hits plus adrenaline-pumpers from the likes of Julian Jordan & Sander van Doorn, Tristan Garner, and Tujamo & Plastik Funk. Relive the sound of a unique and hugely influential talent taking his place at dance music’s top table here.