One of the biggest changes came in 2014 when Billboard transitioned from pure sales to a combination of factors that add online streams and individual track sales to traditional album sales. Every album sale counts as it always has. Meanwhile, the sale of 10 individual tracks counts as one album unit. And you need 3,750 ad-supported streams or 1,250 paid subscription streams to equal a single album unit. In 2020 Billboard expanded its criteria yet again to include music video streams on platforms like YouTube.
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Unsurprisingly, the record for the most number-one albums is held by The Beatles