It was one of the most influential rock albums of all time and arguably the last rock album to drastically change the course of popular music. And come Sept. 24, the album in question, Nirvana’s “Nevermind,” will mark its 20th anniversary with as much fanfare as you’d expect from such a significant piece of pop culture history.

For starters, the album is getting re-released in two versions. There’s a two-CD “deluxe edition” which has the remastered album plus B-sides, live cuts and studio sessions. There’s also a four-CD “super deluxe edition” with all of the above, plus the first official release of the pre-“Nevermind” demos, an alternate mix of the album, a pair of previously unreleased BBC recordings, and a recording of a live 1991 show at Seattle’s Paramount Theater featured on both CD and DVD.

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