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US Billboard Hot 100 : ウィキペディア英語版
Billboard Hot 100

The ''Billboard'' Hot 100 is the music industry standard record chart in the United States for singles, published weekly by ''Billboard'' magazine. Chart rankings are based on radio play, online streaming, and sales (physical and digital).
The weekly sales period was originally Monday to Sunday when Nielsen started tracking sales in 1991, but since July 2015, this has been changed from Friday to Thursday. Radio airplay, which unlike sales figures and streaming data, is readily available on a real-time basis and is tracked on a Monday to Sunday cycle (it was previously Wednesday to Tuesday). A new chart is compiled and officially released to the public by ''Billboard'' on Tuesdays. Example:
*Friday, January 1 – sales tracking-week begins, streaming tracking-week begins
*Monday, January 4 – airplay tracking-week begins
*Thursday, January 7 – sales tracking-week ends, streaming tracking-week ends
*Sunday, January 10 – airplay tracking-week ends
*Tuesday, January 12 – new chart released, with issue post-dated Saturday, January 23
The first number-one song of the Hot 100 was "Poor Little Fool" by Ricky Nelson on August 4, 1958. As of the issue for the week ending December 12, 2015, the Hot 100 has had 1,048 different number-one hits. Its current number-one is "Hello" by Adele.
== History ==
What is now known as the Hot 100 had existed for nearly fifteen years as numerous charts, tracking and ranking the most popular singles of the day in several areas.
During the 1940s and 1950s, popular singles were ranked in three significant charts:
* ''Best Sellers in Stores'': ranked the biggest selling singles in retail stores, as reported by merchants surveyed throughout the country (20 to 50 positions). It is the oldest of the ''Billboard'' charts and dates to 1936.
* ''Most Played by Jockeys'': ranked the most played songs on United States radio stations, as reported by radio disc jockeys and radio stations (20 to 25 positions).
* ''Most Played in Jukeboxes'': ranked the most played songs in jukeboxes across the United States (20 positions). This was one of the main outlets of measuring song popularity with the younger generation of music listeners, as many radio stations resisted adding rock and roll music to their playlists for many years.
Although officially all three charts had equal "weight" in terms of their importance, many chart historians refer to the ''Best Sellers in Stores'' chart when referencing a song's performance prior to the creation of the Hot 100. ''Billboard'' eventually created a fourth singles popularity chart that combined all aspects of a single's performance (sales, airplay and jukebox activity), based on a point system that typically gave sales (purchases) more weight than radio airplay. On the week ending November 12, 1955, ''Billboard'' published The Top 100 for the first time. The ''Best Sellers In Stores'', ''Most Played by Jockeys'' and ''Most Played in Jukeboxes'' charts continued to be published concurrently with the new ''Top 100'' chart.
On June 17, 1957, ''Billboard'' discontinued the ''Most Played in Jukeboxes'' chart, as the popularity of jukeboxes waned and radio stations incorporated more and more rock-oriented music into their playlists. The week ending July 28, 1958 was the final publication of the ''Most Played By Jockeys'' and ''Top 100'' charts, both of which had Perez Prado's instrumental version of "Patricia" ascending to the top.
On August 4, 1958, ''Billboard'' premiered one main all-genre singles chart: the ''Hot 100''. The Hot 100 quickly became the industry standard and ''Billboard'' discontinued the ''Best Sellers In Stores'' chart on October 13, 1958.
The ''Billboard'' Hot 100 is still the standard by which a song's popularity is measured in the United States. The Hot 100 is ranked by radio airplay audience impressions as measured by Nielsen BDS, sales data compiled by Nielsen Soundscan (both at retail and digitally) and streaming activity provided by online music sources.
There are several component charts that contribute to the overall calculation of the Hot 100. The most significant ones are:
* ''Hot 100 Airplay'': ''(per Billboard)'' approximately 1,000 stations, "composed of adult contemporary, R&B, hip hop, country, rock, gospel, Latin and Christian formats, digitally monitored twenty-four hours a day, seven days a week. Charts are ranked by number of gross audience impressions, computed by cross-referencing exact times of radio airplay with Arbitron listener data."
* ''Hot Singles Sales'': ''(per Billboard)'' "the top selling singles compiled from a national sample of retail store, mass merchant and internet sales reports collected, compiled, and provided by Nielsen SoundScan." The chart is released weekly and measures sales of physical commercial singles. With the decline in sales of physical singles in the US, many songs that become number one on this chart often do not even chart on the Hot 100.
* ''Hot Digital Songs'': Digital sales are tracked by Nielsen SoundScan and are included as part of a title's sales points.
* ''Streaming Songs'': a collaboration between ''Billboard'', Nielsen SoundScan and National Association of Recording Merchandisers which measures the top streamed radio songs, on-demand songs and videos on leading online music services.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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