Nirvana's Nevermind turns 20 this September (yep, it has been 20 years and yes, you are old). So Universal thought it only right to celebrate the multi-platinum album by issuing a remastered version of it—as part of a massive set that includes four CDs and one DVD. The set, to be released on Sept. 19, will feature rare B-sides, BBC radio appearances, previously unreleased concert footage, and even unreleased tracks, reports SPIN, which named Nevermind one of the greatest albums of the 1990s. (More Nirvana stories.)