Mainstream Top 40

The Mainstream Top 40 Airplay (also called Pop Airplay, Pop Songs, and Top 40/CHR) is a 40-song music chart published weekly by Billboard Magazine that ranks the most popular songs of pop music being played on a panel of Top 40 radio stations in the United States. The rankings are based on radio airplay detections as measured by Nielsen Broadcast Data Systems (Nielsen BDS), a subsidiary of the U.S.' leading marketing research company. Consumer researchers, Nielsen Audio (formerly Arbitron), refers to the format as contemporary hit radio (CHR).

Mainstream Top 40

The Mainstream Top 40 Airplay (also called Pop Airplay, Pop Songs, and Top 40/CHR) is a 40-song music chart published weekly by Billboard Magazine that ranks the most popular songs of pop music being played on a panel of Top 40 radio stations in the United States. The rankings are based on radio airplay detections as measured by Nielsen Broadcast Data Systems (Nielsen BDS), a subsidiary of the U.S.' leading marketing research company. Consumer researchers, Nielsen Audio (formerly Arbitron), refers to the format as contemporary hit radio (CHR).