FireAid had some surprises in store, but none bigger than the first reunion from Nirvana's surviving members in over a decade.

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.

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.

According to Kim Gordon, women are "natural anarchists" because they are hard-wired to fight from the off, which filters into many musicians' art.

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.”

Legendary grunge band Nirvana reunited at Fireaid for a benefit concert on Thursday, January 30, to support the LA wildfire relief effort.

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

At FireAid on January 30th, Nirvana performed a surprise reunion with the help of guest singers Joan Jett, Kim Gordon, St Vincent and Violet Grohl.