For the last six weeks, the Chainsmokers have had the No. 1 song in America.
“Closer” is an unusual tune to have such a run. It’s an old-fashioned duet between the alt-pop singer Halsey and the duo’s own Andrew Taggart. It’s a mid-tempo, wistful production from a band that rose in popularity on the Las Vegas electronic dance music pool-party circuit.
Its lyrics, about a furtive hookup with an ex, are tempered by small details about being broke and regretful, like recalling a Blink-182 song they both once loved and that their mattress was actually stolen from an old roommate.
The song’s success caps a wild ascent...