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.

St. Vincent performs with Krist Novoselic of Nirvana onstage during the FireAid Benefit Concert for California Fire Relief. (John Shearer/Getty Images for FireAid)

FireAid is a star-studded benefit concert organized for Los Angeles-area wildfire relief. It will take over the Intuit Dome and Kia Forum on Jan. 30th.

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.

The event, set to take place on January 30, will also stream live on Apple TV, Netflix, Paramount, Prime Video, Spotify, SoundCloud and YouTube

Mikael Wood and August Brown were at Inglewood's Intuit Dome and Kia Forum for the FireAid benefit concerts starring Billie Eilish, Lady Gaga, Green Day and Stevie Wonder, among many others.

Billie Joe Armstrong and Billie Eilish. Green Day got things started at the Kia Forum, where they surprised fans with Eilish to help them perform, "Last Night on Earth" from 2009's 21st Century Breakdown.

Follow live updates on the FireAid benefit concert, which will feature performances from Billie Eilish, Lady Gaga and more, as they raise money for Los Angeles-area wildfire victims.

A cavalcade of enormous rock and pop stars, old and new, will perform at an enormous benefit concert in Los Angeles, and streamed around the world.

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

FireAid, a sprawling benefit concert for wildfire relief, featured Joni Mitchell, Stevie Wonder, Billie Eilish, Lady Gaga, members of Nirvana and dozens more.