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STEVE INSKEEP, HOST:
Let's talk about pop music, where the biggest story of 2015 was this.
(SOUNDBITE OF SONG, "HELLO")
ADELE: (Singing) Hello, it's me.
INSKEEP: Adele's "25" may have outsold everything, but it was not the only story. Here is NPR Music's Ann Powers and Jacob Ganz.