Chance the Rapper performs in L.A. in November 2016. His mixtape Coloring Book can't be bought — but by Billboard's rules, it was streamed enough times last year to equal 500,000 album "sales." Kevin Winter/Getty Images hide caption

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Kevin Winter/Getty Images

From Mozart To Adele To Chance The Rapper, Measuring Album Sales Means Being Specific

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Adele's new album, 25, is available today. Courtesy of the artist. hide caption

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Courtesy of the artist.

All Songs +1: Adele Madness

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Top row, left to right: Cover art for Wilco, Kamasi Washington and Grimes; Middle row, left to right: Sufjan Stevens, Chvrches and Kendrick Lamar; Bottom row, left to right: Father John Misty, Joanna Newsom, Courtney Barnett Courtesy of the artists hide caption

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Courtesy of the artists

Poll Results: Listeners Pick Their Favorite Albums Of 2015

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Adele's new album, 25, is out now. Alasdair McLellan/Courtesy of the artist hide caption

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Alasdair McLellan/Courtesy of the artist

'You Can't Prepare Yourself': A Conversation With Adele

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Adele's new album is 21. Courtesy of Sony Music hide caption

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Courtesy of Sony Music

Adele: An Unforgettable Voice, Timeless At 22

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The cover image of Adele's third album, 25. Album cover hide caption

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Album cover

Adele's '25' Is Coming. Where You'll Hear It Is A Mystery For Now

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Fleet Foxes (upper left), Adele (upper right), Peter Bjorn and John (bottom) hide caption

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New Mix: Peter Bjorn And John, Fleet Foxes And More

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Adele won each of the six Grammys for which she was nominated, including the awards for Album, Song and Record of the Year. She also performed for the first time since canceling a tour last year to recover from throat surgery. Kevork Djansezian/Getty Images hide caption

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Kevork Djansezian/Getty Images

Adele Sweeps The Grammy Awards

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Adele Hampton/NPR

Adele: Tiny Desk Concert

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Adele. Courtesy of the artist hide caption

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Courtesy of the artist

Adele: A Soul Sensation At '19,' Revisited

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Adele And Angel Taylor, Recorded Live

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Adele: Chasing 'Pavements' And Pop Stardom

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Adele in Studio on Words & Music from Studio-A 6/9/08

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Adele performs in February. Leon Neal/AFP/Getty Images hide caption

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Leon Neal/AFP/Getty Images

A Record Label With A Midas Touch

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Adele won the song of the year category at this year's Grammy Awards for her tear-jerker "Someone Like You." Kevin Winter/Getty Images hide caption

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Kevin Winter/Getty Images

The Ballad Of The Tearful: Why Some Songs Make You Cry

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