Having reached superstardom with The Joshua Tree and almost blowing it with the vaguely self-important film and album, Rattle & Hum, U2 entered the '90s troubled, fractured and in serious need of retooling. That they did on 1991's Achtung Baby, a surrealistic mix of psychedelic guitar, industrial grunge and hip-hop beats that set the stage for further reinventions over the years.

The 20th Anniversary Super Deluxe Edition (six CDs and four DVDs) includes the original Achtung Baby album, along with its companion set, Zooropa. Plus, there's B-sides, alternate takes and previously unreleased material. Of special note is the inclusion of the Davis Guggenheim-directed documentary From The Sky Down, a warts-and-all look at U2 during the making of this difficult but ultimately triumphant record.