As tens of thousands rocked out to Tom Petty & The Heartbreakers on the mainstage of the BottleRock Napa Valley festival in California May 27, another concert ‘round back made history, according to its organizers.

Approximately 4,400 younger concertgoers wore approximately 4,400 headsets to achieve the largest “silent concert” in North America, a capacity crowd at the Miner Family Winery Stage.

What is also known as Silent Disco – a concert without a P.A. that is broadcast solely through headphones – has been around for at least 20 years but has rarely been implemented on a large scale.

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