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The ''Billboard'' 200 is a record chart ranking the 200 highest-ranking music albums and EPs in the United States, published weekly by ''Billboard'' magazine. It is frequently used to convey the popularity of an artist or groups of artists. Often, a recording act will be remembered by its "number ones", those of their albums that outperformed all others during at least one week. The chart is based mostly on sales (both at retail and digitally) of albums in the United States. The weekly sales period was originally Monday to Sunday when Nielsen started tracking sales in 1991, but since July 2015, tracking week begins on Friday (to coincide with the Global Release Date of the music industry) and ends on Thursday. A new chart is published the following Tuesday with an issue post-dated to the Saturday of the following week. The chart's streaming schedule is also tracked from Friday to Thursday. :Example: ::Friday January 1 – sales tracking week begins ::Thursday January 7 – sales tracking week ends ::Tuesday January 12 – new chart published, with issue date of Saturday January 23. New product is released to the American market on Fridays. Digital downloads of albums are also included in ''Billboard'' 200 tabulation. Albums that are not licensed for retail sale in the United States (yet purchased in the U.S. as imports) are not eligible to chart. A long-standing policy which made titles that are sold exclusively by specific retail outlets (such as Walmart and Starbucks) ineligible for charting, was reversed on November 7, 2007, and took effect in the issue dated November 17. Beginning with the December 13, 2014 issue, ''Billboard'' updated the methodology of their album chart to also include on-demand streaming and digital track sales (as measured by Nielsen SoundScan) by way of a new algorithm, utilizing data from all of the major on-demand audio subscription services in the United States. As of the issue dated December 12, 2015, the number-one album on the ''Billboard'' 200 is ''25'' by Adele. ==History== ''Billboard'' began an album chart in 1945. Initially only five positions long, the album chart was not published on a weekly basis, sometimes three to seven weeks passing before it was updated. A biweekly (though with a few gaps), 15-position Best-Selling Popular Albums chart appeared in 1955. With the explosion of rock and roll music, ''Billboard'' premiered a weekly Best-Selling Popular Albums chart on March 24, 1956. The position count varied anywhere from 10 to 30 albums. The first number-one album on the new weekly list was ''Belafonte'' by Harry Belafonte. The chart was renamed to Best-Selling Pop Albums later in 1956, and then to Best-Selling Pop LPs in 1957. Beginning on May 25, 1959, ''Billboard'' split the ranking into two charts ''Best-Selling Stereophonic LPs'' for stereo albums (30 positions) and ''Best-Selling Monophonic LPs'' for mono albums (50 positions). These were renamed to ''Stereo Action Charts'' (30 positions) and ''Mono Action Charts'' (40 positions) in 1960. In January 1961, they became ''Action Albums—Stereophonic'' (15 positions) and ''Action Albums—Monophonic'' (25 positions). Three months later, they became ''Top LPs—Stereo'' (50 positions) and ''Top LPs—Monaural'' (150 positions). On August 17, 1963 the stereo and mono charts were combined into a 150-position chart called ''Top LPs''. On April 1, 1967, the chart was expanded to 175 positions, then finally to 200 positions on May 13, 1967. In February 1972, the album chart's title was changed to ''Top LPs & Tape''; in 1984 it was retitled ''Top 200 Albums''; in 1985 it was retitled again to ''Top Pop Albums''; in 1991 it became ''The Billboard 200 Top Albums''; and it was given its current title of ''The Billboard 200'' on March 14, 1992. 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「Billboard 200」の詳細全文を読む スポンサード リンク
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