The Billboard Hot 100 is the music industry standard record chart in the United States for singles, published weekly by Billboard magazine. Chart rankings are based on sales (physical and digital), radio play, and online streaming.
The weekly sales period was originally Monday to Sunday, when Nielsen started tracking sales in 1991, but was changed to Friday to Thursday in July 2015. Radio airplay, which, unlike sales figures and streaming data, is readily available on a real-time basis, and is tracked on a Monday to Sunday cycle (previously Wednesday to Tuesday). A new chart is compiled and officially released to the public by Billboard on Tuesdays.
The first number one song of the Hot 100 was “Poor Little Fool” by Ricky Nelson, on August 4, 1958. As of the issue for the week ending on March 31, 2018, the Hot 100 has had 1,071 different number one hits. The current number one song is “God’s Plan” by Drake.
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