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These detections are added up every week among all radio stations to determine airplay points.
Arbitron statistics are also factored in to give "weight" to airplay based on audience size and time-of-day. What separates the charts is which stations and stores are used each musical genre having a core audience or retail group.
Billboard is considered the foremost worldwide authority worldwide in music charts, and the rankings have gained a following among the general public.
On January 4, 1936, Billboard magazine published its first music hitparade.
As a result, in October 1987, it was now possible for the chart, incorporating sales up to close of business on Saturday, to be announced on Sunday afternoon, rather than being delayed until Tuesday as was previously the case.
In 1990, the chart came under the auspices of CIN (Chart Information Network), a syndicate including the BBC, Spotlight (publishers of Music Week), the BPI and BARD (British Association of Record Distributors).
For the first time a professional polling organisation, BMRB, was commissioned to oversee the chart, and a pool of 500 record shops was used - more than twice as many as had been used for any previous chart.
The new Official Top 50 was inaugurated in the week ending 12 February 1969.
A variety of song charts followed, which were eventually consolidated into the Hot 100 by mid-1958.In 1982, BMRB lost their contract to Gallup, who arranged for electronic data gathering to replace the old sales diary method of compilation.The first chart terminals appeared in record shops in 1984.The first British singles chart was published in the November 14, 1952 edition of the New Musical Express.It was at first little more than a gimmick, a tool in the circulation war against NME's much older (and more popular) rival Melody Maker.