The Billboard Hot 100 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), online streaming, and radio airplay in the U.S.A new chart is compiled and released online to the public by Billboard's website on Tuesdays but post-dated to the following Saturday, when the printed magazine first reaches newsstands. The weekly tracking period for sales is currently Friday–Thursday, after being changed in July 2015. It was initially Monday–Sunday when Nielsen started tracking sales in 1991. This tracking period also applies to compiling online streaming data. Radio airplay is readily available on a real-time basis, unlike sales figures and streaming, but is also tracked on the same Friday–Thursday cycle, effective with the chart dated July 17, 2021. Previously, radio was tracked Monday–Sunday and, before July 2015, Wednesday–Tuesday.The first number-one song of the Billboard Hot 100 was "Poor Little Fool" by Ricky Nelson, on August 4, 1958. As of the issue for the week ending on April 20, 2024, the Billboard Hot 100 has had 1,168 different number-one entries. The current number-one song on the chart is "Like That" by Future, Metro Boomin and Kendrick Lamar.