British crooner Adele is still rolling in the dough from "Rolling in the Deep" and the other 10 songs from her smash hit sophomore album 21. The album's latest milestone? 10 million copies sold, which serendipitously makes 21 the 21st album to reach those rarified heights since Nielsen SoundScan began tracking album sales in 1991. But Adele still has a long climb up the charts if she plans to crack the top 10, which spans an impressive, incongruous list of artists that includes Metallica, Shania Twain, The Beatles, and N 'Sync. Which albums have sold even better than Adele's ubiquitous 21? Here, the 10 bestselling albums in Nielsen SoundScan history:
1. Metallica (Metallica, 1991) — 15.8 million
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