The Chainsmokers (aka Alex and Drew) use Uber just like us regular people!
They happened to get the car of an Uber driver named Jonathan who was a big fan and recognized them instantly! They asked him what his favorite song is, and he put on “Roses”. Then they processed to have a sing along over the course of the ride to their performance. At the duo’s request Jonathan kept it going by recording himself with his other fares singing along too.
It was compiled into this awesomeness you see here: