Mariah Carey is looking back on 30 years in the game.

On Oct. 2, the pop icon will release The Rarities, a two-disc retrospective featuring a collection of personal favorites from her vault. The career-spanning compilation includes previously unreleased recordings from 1990 through 2020, along with “hidden musical jewels from her personal archives.”

According to a press release, Carey selected songs with “personal relevance and meaning,” which are further explored in her upcoming memoir, The Meaning of Mariah Carey.

“Basically I found stuff in my vault that I either started to work on like a long time ago and never released or that I kinda wanted to finish mixing or do whatever,” she said on “GMA.” “But they’re songs that have previously not been released so it’s exciting and it’s a monumental occasion for my career.”

The Rarities will include a second disc of never-before-released audio from Live at the Tokyo Dome, Carey’s first concert performance in Japan around her 1996 “Daydream World Tour.”

“Save the Day,” which arrives Friday, is the first release from The Rarities and is based off a previously-written song that was never completed. “I started writing this years ago,” says Mariah, “and the message rings true now more than ever: ‘We’re all in this together.'”

The Jermaine Dupri-produced song samples the Fugees 1996 hit “Killing Me Softly” and features Ms. Lauryn Hill’s vocals from the original song. “‘Save the Day’ sends a message that inspires hope, resilience and most importantly people coming together for the collective good,” reads the press release.

The Rarities is part of #MC30, an ongoing celebration of the 30th anniversary of Carey’s debut album and the evolution of her career. Weekly #MC30 releases have included digital EPs, remixes, bonus cuts, rare tracks, a cappella moments, and live performances.

Carey is also gearing up to release her memoir, The Meaning of Mariah Carey, on Sept. 29.