An absolute highlight of FireAid was the comet-like reappearance of the remaining members of Nirvana onstage together playing the band's songs again.

A rotating group of women vocalists joined the surviving members of the legendary '90s band for a raucous reunion set.

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

The surviving members of Nirvana reunited for a surprise performance at the FireAid benefit concert in Los Angeles, California last night (January 30th), with the grunge icons having hit the stage to play a few classic songs alongside guest musicians St. Vincent, Kim Gordon, Joan Jett, and Violet Grohl.

In the early days of Sonic Youth, Kim Gordon drew a lot of inspiration from Detroit punk band Destroy All Monsters, particularly the singing style of Niagara.

Dave Grohl, Krist Novoselic and Pat Smear reunited and were helped by variety of guest vocalists for a Nirvana performance at the FireAid benefit concert.

The band also brought out Dave Grohl's 18-year-old daughter, Violet Grohl, to wrap up the set with an emotional rendition of "All Apologies"

A trio of singers filled in for Kurt Cobain as Dave Grohl, Pat Smear and Krist Novoselic performed "Breed," "School" and "Territorial Pissings.”

St. Vincent, Joan Jett and Kim Gordon joined Pat Smear and original Nirvana members Dave Grohl and Krist Novoselic onstage for a reunion of sorts at FireAid Thursday. Violet, Jett, and Gordon each subbed in for the late Kurt Cobain.

Pop stars, rock legends, first-responders and wildfire survivors came together for FireAid, a star-studded, two-venue benefit concert that stretched into the early-morning hours Friday to raise money for those affected by the recent wildfires.

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