Until now, the Billboard 200 chart has been ranked based on albums sales, but that's about to change. On November 30th, that list will expand its criteria to include sales of a record's individual tracks and streaming plays for the chart that'll post on December 4th. Ten tracks sold will equal one album, while 1,500 spins via the likes of Spotify, Rdio or Beats Music from the same title will count as one sale, too. "Now we have the ability to look at that engagement and gauge the popularity of an album over time," Billboard's director of charts Silvio Pietroluongo told The New York Times. As you might expect, pop stars stand to benefit most.