Watch the video here...
Billie Eilish is currently on her 'Hit Me Hard and Soft' world tour, and one part of her show is going viral due to the amazing reactions from the crowd.
Billie asked the whole arena to go completely silent for her to live-record her vocals for a performance of her song 'when the party's over' from her debut album.
She used a loop pedal during the performance to layer the vocals.
Watch the moment here:

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