The Billboard Hot 100 is the American music industry standard popularity chart for singles issued weekly by Billboard magazine. Chart rankings are based on radio play, streaming online, and sales.
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 July 19, 2014, the Hot 100 has had 1,036 different number-one hits.
A new chart, the Pop 100, was created by Billboard in February 2005 to answer criticism that the Hot 100 was biased in favor of rhythmic songs, as throughout most of its existence, the Hot 100 was seen predominantly as a pop chart. It was discontinued in June 2009 due to the charts becoming increasingly similar.
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