2015: ‘25’ by Adele

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– Sales: 8,008,000

When she was only 21, Adele blew the music world’s collective mind with “21.” At age 25, she released “25,” and fans went justifiably hog-wild. The album was such an instant smash that it became the bestseller of 2015 in its first week, outselling every other record on the Billboard 100 combined.

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