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 - Billie Eilish and Green Day kick off FireAid, a benefit for LA wildfire relief - 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