Billie Eilish, Lady Gaga and Nirvana reunion: The biggest moments from FireAid / Green Day, Billie Eilish, Nirvana perform at FireAid concert / Joni Mitchell, Billie Eilish and More Sing Love Letter to L.A. at FireAid / Joni Mitchell, Billie Eilish and Alanis Morissette to perform at FireAid, star-studded benefit concerts following California wildfires / Sting, Lady Gaga, Billie Eilish and the Red Hot Chili Peppers to perform at FireAid benefit concert / Billie Eilish, Lady Gaga and Rod Stewart among stars to perform at LA wildfire charity concert / Billie Eilish, Joni Mitchell and Lady Gaga Set for FireAid Benefit Concert / Lady Gaga and Billie Eilish among artists to perform at benefit concert for LA wildfire victims / Billie Eilish, Green Day and more to headline FireAid benefit concert