Joni Mitchell, Billie Eilish and Others Perform at FireAid Concert NYT Par : Matt Stevens and Ben Sisario 31 janvier 2025 à 11:32 Katy Perry belted out “California Gurls,” and Joni Mitchell offered a rare performance as Angelenos spoke movingly about loss — and resilience. © Daniel Cole/ReutersGreen Day and Billie Eilish performed at the FireAid benefit, an all-star concert to raise money to help people recover from the wildfires.