Dozens of young people gather on a dark, San Francisco street. It’s well past midnight and they’ve come to party. The deejay cues up pulsing dance music that fills their ears and gets their bodies swaying. Surprisingly, people asleep in nearby homes don’t realize anyone is outside, unless they happen to peer out their windows. Welcome to the new age of silent disco.

Using wireless headphones, hard-partying music lovers in San Francisco stage street dances without driving the neighbors up a wall.

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