Billboard dating breaking up after 6 months of dating
These detections are added up every week among all radio stations to determine airplay points.
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To add to the confusion, the chart used by the BBC on their popular shows Pick of the Pops and Top Of The Pops was actually calculated by averaging out all the others, and so didn't agree with any of them, and was prone to tied positions.
It wasn't until 1969 that a truly reliable, official chart emerged, from an alliance between the BBC and Record Retailer.
At the time, instead of using Sound Scan or BDS, Billboard obtained its data from manual reports filled out by radio stations and stores.
According to the 50th Anniversary issue of Billboard, prior to the official implementation of Nielsen Sound Scan tracking in November 1991, many radio stations and retail stores removed songs from their manual reports after the associated record labels stopped promoting a particular single.
They were followed by the Hot 100 and the R&B chart in 1991.