It’s become a new holiday tradition: every year in New York (and a growing number of cities around the globe), crowds gather and hold boomboxes all cued up to the same song. That song is an ambient techno Christmas piece called “Unsilent Night,” by the composer Phil Kline. Jonathan Mitchell marched through the streets along with Kline and hundreds of boombox carolers.

Sign up for our daily newsletter

Sign up for The Top of the World, delivered to your inbox every weekday morning.