The Pop 100 was a songs chart that debuted in February 2005 and was released weekly by Billboard magazine in the United States until its discontinuation in 2009. It ranked songs based on airplay on mainstream top 40 radio stations, singles sales, and digital downloads.
The Pop 100 was conceived by Michael Ellis, and was first published in the Billboard issue of February 12, 2005.
The Pop 100 used only mainstream radio impressions data, derived from the Pop 100 Airplay chart. Its calculation also considered digital and physical sales. When the Pop 100 was first published, the Hot 100 changed its format as well. Digital downloads were incorporated into the equation which tabulates a song's rank on the chart. Prior to this, only radio airplay and physical singles sales were used to determine positions.<ref... Read More