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Mainstream Rock is a music chart in ''Billboard'' magazine which ranks the most-played songs on mainstream rock radio stations, a category that combines the formats of active rock and heritage rock. ==History== The Rock Albums & Top Tracks charts were introduced in the March 21, 1981, issue of ''Billboard''. The 50- and 60-position charts ranked airplay on album rock radio stations. Because album-oriented rock stations focused on playing tracks from albums rather than specifically released singles, these charts were designed to measure the airplay of any and all tracks from an album. Rock Albums combined airplay from all tracks from a particular album to come up with the top albums, while Top Tracks listed the top individual songs being played on rock radio. Mike Harrison of ''Billboard'' explained that when major artists release albums, more than one song from the album can become popular at the same time.〔 The first number-one song on the Top Tracks chart was "I Can't Stand It" by Eric Clapton.〔 In September 1984, the two charts were merged and renamed Top Rock Tracks. It reduced from a 60-song tally to 50 songs on October 20, 1984, following a major revamp to the magazine. Coinciding with an increase in its reporting panel of album rock stations, the name of the chart was changed again with the issue dated April 12, 1986, to Album Rock Tracks. In November 1991, instead of reporting panels, ''Billboard'' changed its methodology of measuring airplay by using monitored airplay as provided by Nielsen Broadcast Data Systems to compile many of its charts. As a result, this data showed that many songs could spend months to over a year on the Album Rock Tracks chart. ''Billboard'' decided to drop to a 40-position chart (still its current format), and songs that fell out of the top 20 and after spending 20 weeks on the chart were moved to a new 10-position recurrent chart. The recurrent chart was scrapped two years later, but not the methodology. Acknowledging the trend that rock radio was moving away from being an album-based format to a song-focused one, ''Billboard'' changed the name of the chart to Mainstream Rock Tracks beginning with issue dated April 13, 1996. The Mainstream Rock Tracks chart did not appear in the print edition of ''Billboard'' from its issued dated August 2, 2003, being accessible only through the magazine's subscription-based website, Billboard.biz. In late 2013, the chart was reintroduced to its primary website and magazine. When ''R&R'' ceased publication in June 2009, ''Billboard'' incorporated its rock charts, Active Rock and Heritage Rock into its own publication. The radio station reporters of the two charts combine to make up the Mainstream Rock chart. Active rock stations concentrate on current hits over classic rock standards while heritage rock stations put a greater emphasis on classic rock with a few newer tracks mixed in. The individual Active Rock and Heritage Rock components were discontinued by ''Billboard'' at the end of November 2013 due to a lack of difference between the two charts. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Mainstream Rock (chart)」の詳細全文を読む スポンサード リンク
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