The Billboard Hot is the music industry standard record chart in the United States for songs, published weekly by Billboard magazine. Chart rankings are based on sales physical and digital , radio play , and online streaming in the United States. The weekly tracking period for sales was initially Monday to Sunday when Nielsen started tracking sales in , but was changed to Friday to Thursday in July This tracking period also applies to compiling online streaming data. Radio airplay, which, unlike sales figures and streaming, is readily available on a real-time basis, is tracked on a Monday to Sunday cycle previously Wednesday to Tuesday. As of the issue for the week ending on August 8, , the Billboard Hot has had 1, different number one entries. The chart's current number-one song is " Cardigan " by Taylor Swift. Prior to , Billboard ' s lead popularity chart was the Honor Roll of Hits , established in This chart ranked the most popular songs comprised by record and sheet sales, disk jockey, and juke box performances as determined by Billboard ' s weekly nationwide survey.
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Subscriber Account active since. In the history of modern music rankings, only a handful of songs have ever debuted at No. The Hot is widely considered the definitive all-genre singles chart in the US. Although it was officially launched in , Billboard began using modern airplay and sales data in — allowing for more time-sensitive calculations and accurate rankings. Moreover, Billboard began incorporating digital sales data in and YouTube data in The chart methodology is updated at least once a year , to reflect rapidly evolving listening trends.
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This is a comprehensive listing that highlights significant achievements and milestones based upon Billboard magazine 's singles charts, most notably the Billboard Hot This list spans the period from the issue dated January 1, to present. The Billboard Hot began with the issue dated August 4, , and is currently the standard popular music chart in the United States. These charts, which ranged from 20 to slots, were phased out at different times between and Though technically not part of the Hot chart history, select data from these charts are included for computational purposes, and to avoid unenlightening or misleading characterizations. In , for the 50th anniversary of the Hot , Billboard magazine compiled a ranking of the best-performing songs on the chart over the 50 years, along with the best-performing artists. Also shown are the artists placing the most songs on the overall "all-time" top song list. Source: . Source:  . Source: .