From The Art and Popular Culture Encyclopedia

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-	'''Alternative Songs''' (formerly '''Modern Rock Tracks''' and '''Hot Modern Rock Tracks''') is a music chart in the [[United States]] that has appeared in [[Billboard magazine|''Billboard'' magazine]] since September 10, 1988. It lists the 40 most-played songs on [[modern rock]] radio stations, most of which are [[alternative rock]] songs. The chart was introduced as a companion to the [[Mainstream Rock Tracks]] chart and its creation was prompted by the explosion of alternative music on American radio in the late 1980s.	+
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-	The chart is based solely on radio airplay and is a component chart of the [[Billboard Hot 100|Hot 100]]. As of 2008, approximately 80 radio stations are electronically monitored 24 hours a day, seven days a week by [[Nielsen Broadcast Data Systems]]. 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.	+
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-	Many rock artists do not release commercial [[single (music)|singles]] in the U.S. Several popular songs which were not released as commercial singles did not qualify for the Hot 100 before December 1998, but performed very well on Modern Rock Tracks.	+
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1. redirectNielsen Holdings