How Bags of Fiberglass Help Billie Eilish Sound Better

Drew Thornton noticed something surprising about the arena that the New York Islanders hockey team now calls home—Billie Eilish sounded great inside.

It could have been the wide, thin bags filled with fiberglass tucked against the ceiling of the new digs, UBS Arena, which opened last year. Or the panels pockmarked with holes strategically placed to capture loud noise. Or the sound-absorbent “bass trap” built above the broadcast booth, or maybe the upholstered seats.