21 unified the fragmented pop audience like few other albums have in this century.

It was named Billboard's No. 1 album of the year for both 2011 and 2012.

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Whitney Houston's "Whitney: The Greatest Hits" holds at No. 2, fun.'s "Some Nights" debuts at No. 3. By Keith Caulfield, Billboard 54th Grammy Awards Adele Red Carpet - H 2012 This is also the ninth ...