There is a distinction between sales charts and airplay charts. When a record label has a number one single, it earns that designation based on its position on a sales chart. If that record is number one on the radio station, it reaches that position based on its airplay, location of the radio station, and how many singles it sold.
Billboard has the most widely used airplay charts and includes every significant music genre.
Billboard has 25 airplay charts that detect airplay across 140 radio markets. To compile the airplay charts,
Billboard monitors 140 radio markets, over 1,600 radio stations to see over 100 million songs each year. To ensure airplay detection, label marketers must register their recorded music with the
Broadcast Data Systems (BDS), the technology provider of
Billboard.
Billboards weekly airplay charts rank
singles according to the amount of airplay they receive on monitored radio stations and the resulting size of the combined audience that heard the song being played. == References ==