Martin Garrix, 17, is taking over dancefloors and the pop charts -- when he's not busy with homework

The backstage lounge at last summer's three-day Belgian festival Tomorrowland, often called "the dance music Olympics," was teeming with DJs of all stripes. There were house godfathers Mark Farina and Derrick Carter mugging for each other's cellphone cameras; Tiësto holding court at the bar, with his toothy smile and imposing height; bubbling-up buddies Carnage and Porter Robinson, talking about how they secretly want to work with Soulja Boy ("More secret to him," Robinson said.

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