MONTREAL, QUEBEC – AUGUST 05: Billie Eilish performs at the Osheaga Music and Arts Festival at Parc Jean-Drapeau on August 05, 2023 in Montreal, Quebec. (Photo by Mark Horton/Getty Images)

Billie Eilish’s brother Finneas co-writes and produces all of his sister’s songs, and she told fans at a recent concert that she’d quit music altogether if their collaborative relationship ever ended. “We make everything together, and, you know…if Finneas ever doesn’t want to make music with me, I just won’t make music anymore, for real,” she said between songs. “That would suck. Anyway, um… yeah, I just feel really grateful to have him on tour with me right now. I just owe everything to him, for real, in my life, and I love him very much and he’s my best friend in the world.”

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