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The CHR/Pop chart was used for Westwood One's "Casey's Top 40" (January 1989 – March 1998) and Premiere Networks' American Top 40 (March 1998 – October 2000, and August 2001 – January 2004). The current Ryan Seacrest AT40 show uses Mediabase 24/7. The Hot AC chart was used for both Casey's Hot 20 and the Hot AC version of American Top 20.
Mediabase is a music industry service that monitors radio station airplay in 180 US and Canadian markets. Mediabase publishes music charts and data based on the most played songs on terrestrial and satellite radio, and provides in-depth analytical tools for radio and record industry professionals.
Alternative Airplay is a record chart published by the music industry magazine Billboard that ranks the most-played songs on American modern rock radio stations. Introduced in September 1988, [1] the chart is based on airplay data compiled from a panel of national rock radio stations, with songs being ranked by their total number of spins per week. [2]
The Billboard Mainstream Rock chart is compiled from the number of airplay songs received from active rock and heritage rock radio stations in the United States. [1] Below are the songs that have reached number one on the chart during the 2020s, listed in chronological order.
During the 1960s and 1970s, Billboard continued to collect airplay data as a component of the Hot 100 but did not make the chart public. [3] The airplay-only chart debuted as a 30-position chart on October 20, 1984, and was expanded to 40 positions on May 31, 1986. [4] Rankings were based on playlists received by a panel of Top 40 radio stations.
In 1993, 13 songs topped the chart, then published under the title Hot Adult Contemporary. The chart was compiled based on playlists submitted by radio stations through the issue of Billboard dated July 10, after which a new methodology was introduced which used airplay data compiled by Nielsen Broadcast Data Systems, which provided a more ...
On the Hot AC version of AT40, "Use Somebody" by Kings of Leon set the all-time record in 2011 at 117 consecutive weeks. American Top 40 also became more interactive, involving online song voting and e-mail. In December 2006, the series' website was revamped, and the online song voting was discontinued in favor of publishing the Hot AC chart.
Following the purchase, Nielsen Broadcast Data Systems replaced Mediabase in monitoring airplay for charts, beginning with the issue dated August 11, 2006. [ 5 ] [ 6 ] Billboard themselves introduced the chart in their July 5, 2008 issue, appropriating the same Nielsen data, [ 2 ] and became its sole publisher after Radio & Records ceased ...