Check out four unforgettable collaborations that took place during the FireAid benefit concert, including a Stephen Stills-Graham Nash reunion and a duet between Stevie Wonder and Sting.

FireAid LA brought together a powerhouse lineup at the Kia Forum and Intuit Dome in Inglewood to support relief efforts for the devastating wildfires that have claimed 29 lives and caused billions in damage.

Audiences tuning into the FireAid benefit concert for Los Angeles on Thursday night (Jan. 30) were surprised with an early treat when pop superstar Billie Eilish made a surprise appearance alongside Billie Joe Armstrong and the rest of Green Day for a stirring opening performance.

Billie Eilish, Dr. Dre, Stevie Wonder, Green Day, Joni Mitchell, No Doubt and the remaining members of Nirvana all performed.

Two concerts collectively referred to as FireAid kicked off at the Kia Forum and the Intuit Dome in the city of Inglewood in Los Angeles County to support relief efforts in the wake of the deadly wildfires that ignited earlier this month in the LA area, claiming 29 lives and causing billions of dollars in damage.

From surprise guests to touching moments of humility, here were the most memorable moments from the Jan. 30 FireAid benefit concerts in Los Angeles.

Grammy Awards will include a special Los Angeles tribute and performances by Billie Eilish, Shakira and others.

Pink, who always dials it up to 100, performed Janis Joplin's “Me and Bobby McGee” and Led Zeppelin's “Babe I'm Gonna Leave You.” While introducing John Mayer, she addresses the crowd: “Ladies and gentlemen, and every other gender which absolutely exists,” seemingly a reference to President Trump's “two gender” declaration.

Nirvana, Lady Gaga, Billie Eilish, Green Day, Stevie Nicks, No Doubt and more performed at the Los Angeles benefit concert FireAid.

The FireAid benefit concert, a one-night-only event, was held at the Intuit Dome and the Kia Forum in Los Angeles, with performances at each venue. Billie Eilish, Earth, Wind and Fire, Gracie Abrams,

Featuring a Nirvana reunion, a surprise appearance by Dr. Dre and a stirring performance of 'Both Sides Now' by Joni Mitchell.