R.E.M.'s complete catalog and much more is now "Mastered for iTunes." Remastered versions of the now-defunct group's albums were unveiled in the online music store this week, along with two special collections jam packed with rarities.  "The Complete Rarities: I.R.S. 1982-1987" offers 25 non-album tracks from the first half of the band's history, while "The Complete Rarities: Warner Bros. 1988-2011" features 131 tracks from the height of R.E.M.'s commercial success and beyond.

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They've also made their Record Store Day Unplugged set available digitally. It features their complete 1991 and 2001 performances on MTV's "Unplugged" and 11 tracks that never aired. They've also mastered all of their albums for iTunes.