Six songs into the first of her two nights at a full Smoothie King Center, Billie Eilish sat cross-legged and convened a high-tech campfire singalong.

She asked her audience, nicely but firmly, to go against its collective instinct and be quiet. She needed silence so she could record “loops” of her own voice in real time, then stack them together to harmonize with herself on “When the Party’s Over.”

Save the squawk of an EMT’s walkie-talkie and a couple of outliers who were quickly shouted down, the arena did, in fact, go quiet. Once the arrangement’s base of harmonies was built, Eilish laid on her back, playing with her hair as she sang the rest of "When the Party's Over."

It was as if she was back in her bedroom at her parents’ house, where she and her co-writer/producer brother, Finn

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