20th Anniversary Edition. 90 page special collector's book - unreleased photos and exclusive memorabilia. 70 total tracks - 35 unreleased. Nevermind was never meant to change the world, but you can never predict when the Zeitgeist will hit, and Nirvana's second album turned out to be the place where alternative rock crashed into the mainstream. This wasn't entirely an accident, either, since Nirvana did sign with a major label, and they did release a record with a shiny surface, no matter how humongous the guitars sounded. And, yes, Nevermind is probably a little shinier than it should be, positively glistening with echo and fuzzbox distortion, especially when compared with the black-and-white murk of Bleach.

After the lackluster performance of Adrenalize, Def Leppard realized it was time to abandon their trademark wall-of-guitars sound. Jettisoning producer Mutt Lange – who, admittedly, was busy producing his wife, country singer Shania Twain – the group stripped its sound to the basics for Slang. There are very few layers-of-guitar effects on the album, just straight, crunching chords. Most notably, Rick Allen has returned to playing acoustic drums after playing an electronic kit for nearly a decade. The change in approach is apparent and welcome – Def Leppard hasn't sounded so immediate since Pyromania. Furthermore, they decided to expand their musical vocabulary slightly, working elements of R&B and funk into the rhythms. Not all of the experiments work, but Def Leppard sound revitalized, particularly when they attack a straightforward rocker. Slang would have been even better if they had come up with a set of hooks that sounded as alive as their performance, but the album is a much-needed return to form for the group.