On Wednesday, December 3, Billboard says it will premiere its biggest upgrade to its 200 chart in more than 23 years. The chart, which currently tracks the top 200 albums of the week by sales, will be the first to include on-demand streaming and digital track sales.
To do this, the chart will incorporate streaming service data measured by Nielsen Entertainment by way of a new algorithm. Billboard says it's the "most substantial methodology update since 1991," when Billboard began using point-of-sale data to measure album sales.