The chart debuted in Billboard Magazine in its issued date October 3, , with the introduction of two Top 40 airplay charts, Mainstream and Rhythm-Crossover.
This data was also used as the airplay component for Hot tabulations. They returned to the print edition in the August 2, , issue. Songs on the chart are ranked by the total number of spins detected per week.
Songs which gain plays or remain flat from the previous week receive a bullet. A song also receives a bullet if its percentage loss in plays does not exceed the percentage of monitored station downtime for the format. If two songs are tied in total plays, the song with the larger increase in plays is placed first. There are forty positions on this chart and it is solely based on radio airplay. Songs are ranked by a calculation of the total number of spins per week with its "audience impression", which is based upon exact times of airplay and each station's Arbitron listener data.
Songs receiving the greatest growth receive a "bullet", although there are tracks that also get bullets if the loss in detections doesn't exceed the percentage of downtime from a monitored station. A song with six or more spins in its first week is awarded an "airplay add". If a song is tied for the most spins in the same week, the one with the biggest increase that previous week ranks higher, but if both songs show the same amount of spins regardless of detection the song that is being played at more stations is ranked higher.
Since the introduction of the chart until , songs below No. In the chart week of December 3, , songs below No. Since the issue dated December 4, , songs older than 20 weeks on the chart are moved to recurrent after they drop below No. Whereas the Top 40 Mainstream and Pop Airplay charts both measured the airplay of songs played on Mainstream stations playing pop-oriented music, the Pop Airplay like the Hot Airplay measured airplay based on statistical impressions, while the Top 40 Mainstream chart used the number of total detections.
Source: . On October 19, , the Mainstream Top 40 co-hosts, Gary Trust and Trevor Anderson, gave hints as to what the number 1 all-time Mainstream Top 40 song was going to be on the charts. Source: . From January 9, , until its last first-run show on January 28, , American Top 40 used this chart as its main source after having used the Hot Airplay chart since From Wikipedia, the free encyclopedia.
For other uses, see Pop Song. See also: List of artists who reached number one on the Billboard Mainstream Top 40 chart. This section does not cite any sources. Please help improve this section by adding citations to reliable sources. Unsourced material may be challenged and removed. November Learn how and when to remove this template message.
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