Charlotte Rowan leads DR Pigekoret, an ensemble of 50 vocalists whose ages range from 16 to 22. Its repertoire covers several kinds of music rather than concentrating on a single tradition. Danish songs and established hymns sit alongside pop selections and works from contemporary classical music. The Eilish cover fits within that breadth, combining material from the choir’s pop repertoire with an unaccompanied treatment shaped by massed harmony and solo voices.

Rowan has characterized the ensemble as an example of the power that a community of talented young people can possess. In the May 2026 rendition, that communal format was central to how the arrangement worked: many live voices created the vocal layers associated with the original recording, while individual singers emerged for lead passages. The choir did not add an instrumental part, despite the grand piano’s presence, and its members remained responsible for the complete musical texture heard during the performance.

“When The Party’s Over” was not the ensemble’s first interpretation of music by Eilish. In December 2023, DR Pigekoret combined “What Was I Made For?” with “O Holy Night.” The former was Eilish’s contribution to the soundtrack of the Barbie film, while the latter is a Christmas carol. That performance therefore brought her soundtrack song into a pairing with a traditional seasonal work, reflecting the choir’s repertoire of both pop music and hymns.

The group had already recorded another Eilish composition several years before that December 2023 pairing. In 2020, DR Pigekoret issued its rendition of “Come Out And Play.” The release preceded both its combination of “What Was I Made For?” and “O Holy Night” and the May 2026 a cappella performance of “When The Party’s Over.”