By Kyle Anderson
Updated October 26, 2011 at 04:00 AM EDT
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Credit: Anton Corbijn

U2 had everything to lose in 1991, when they reinvented themselves as an electronics-obsessed art project. The six discs in Achtung Baby: Uber Deluxe Edition may seem like overkill, but most everything here, from the raw demos (a stripped-away ”Mysterious Ways” is especially revelatory) to the cache of beat-science remixes that put 1993’s confusing Zooropa into better context, is essential to understanding the most inscrutable stadium-filling band in history. A

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