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The Billboard Hot 100 is the American music industry standard singles popularity chart issued weekly by Billboard magazine. Chart rankings are based on radio play and sales; the tracking-week for sales begins on Monday and ends on Sunday, while the radio play tracking-week runs from Wednesday to Tuesday. A new chart is compiled and officially released to the public by Billboard on Thursday. Each chart is dated with the "week-ending" date of the Saturday two weeks after. Example:Monday, January 1 – sales tracking-week beginsWednesday, January 3 – airplay tracking-week beginsSunday, January 7 – sales tracking-week endsTuesday, January 9 – airplay tracking-week endsThursday, January 11 – new chart released, with issue date of Saturday, January 20.