To formulate the charts, Billboard takes into account a slew of metrics that each carry varying weights. Those metrics include digital and physical sales, streams and radio airplay impressions. But the criteria have changed over the years — especially in the past decade, as streaming has become more of a revenue generator. “Streaming has changed everything — not just music consumption behaviour, but the way music is made, how albums are conceived and sequenced, and even the way that songs are written and produced,” said Larry Miller, a professor of music business at New York University’s Steinhardt School.
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