Rolling In The Deep by Adele becomes the 2nd song to sell 8 million copies following the Black Eyed Peas's "I Gotta Feeling." The song is also the first by a solo artist and a female artist.
"Candle In The Wind 1997" sold 8 million copies in just 15 weeks. That, of course, reflected the extraordinary circumstances that made that song a hit—the shocking, early death of one of the world's most famous people. The song sold 3,446,000 singles in its peak week (yes, week).
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In addition to having the second best-selling digital song, Adele has the #1 best-selling digital album. 21 has sold 2,988,000 digital copies. That's slightly more than the next two digital best-sellers combined. Mumford & Sons has both the #2 and #3 best-selling digital albums, Sigh No More (1,658,000) and Babel (1,308,000).