Compilation Methods and Listing
From June 1959 through August 1985, Billboard compiled the chart based on playlists reported by radio station and retail sales outlets surveys. In 1992, Billboard employed updated data capture technology in compiling the chart, using point-of-sale retail information provided by Nielsen SoundScan, input from radio station airplay monitoring provided by Broadcast Data Systems and playlists from small-market systems.
The chart is generally considered to be an extension of the Billboard Hot 100. The chart's first issue mentions that a rank position indicates "relative potential to earn an early listing on the Hot 100." All issues of Billboard from August 28, 1961 to August 24, 1985 indicated that songs on the chart were equivalent to positions under 100 (i.e. #1 on the Bubbling Under Hot 100 Singles chart being equivalent to #101 relative to the Billboard Hot 100). Songs that have hit the Billboard Hot 100 are ineligible for inclusion on the Bubbling Under Hot 100 Singles chart.
Read more about this topic: Bubbling Under Hot 100 Singles
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