"Closer" — The Chainsmokers ft. Halsey

Over 3.1 billion streams. The EDM-pop track spent 12 weeks at #1 in 2016 and essentially defined the "festival pop" genre. The Chainsmokers went from novelty act (#Selfie) to legitimate hitmakers, and Halsey became a household name. The mattress metaphor still lives rent-free in everyone's head. Source: Spotify Charts.