In a tweet tied to her upcoming memoir, the pop star opened up about alternative-rock recordings she apparently made in the 1990s.
The musician and driving force behind Nirvana died on April 5, 1994.
Soundgarden's 1994 album is an unflinching, sprawling masterpiece.
Chris Cornell is just the latest grunge frontman to suffer an untimely death.
The singer had performed with his band in Detroit the day of his death, which police are investigating as a suicide.
Scott Weiland died from a mix of cocaine, MDA (a type of ecstasy) and alcohol, according to toxicology reports.
Facts and revelations from the Kurt Cobain documentary we didn't know we needed.