The Chainsmokers released the number-one song Closer.
`` Closer '' is a song by American DJ duo The Chainsmokers , featuring American singer Halsey . The Chainsmokers . `` Do n't Let Me Down '' became their first top 5 single there and won the Grammy Award for Best Dance Recording at the 59th awards ceremony , while `` Closer '' became their first number-one single on the chart .