The Bubbling Under Hot 100 Singles (also known as the Heatseekers Songs chart) is a chart released weekly by Billboard in the United States. It comprises 25 positions that represent songs that are close to charting on the main singles chart, the Billboard Hot 100, acting as an extension to Hot 100. Many times, however, singles halt their progress on this chart, and never debut on the Hot 100. Other songs initially appear on the Bubbling Under chart only to resurface a year or two later as a more successful hit.
The Bubbling Under Hot 100 Singles chart can also be seen as a 25-position addendum to the Hot 100, but now only represents the 25 songs below position 100 which have not yet appeared on the Hot 100. If a song were to be ranked at #99 but then moved the following week to a position that is comparable to #105, it would not be eligible for the Bubbling Under Hot 100 Singles chart because it already appeared on the Hot 100 (although it would be eligible to reenter the Hot 100 if it rebounded to such a level). Throughout the sixties and early seventies songs could appear on the Bubbling Under Hot 100 Singles chart even after Hot 100 runs; for example Helen Shapiro's "Walkin' Back to Happiness" entered the Hot 100 at #100 on December 4, 1961, yet reentered the twenty-position Bubbling Under on three separate occasions up until January 13, 1962. The chart has sometimes been reduced to as few as 15 songs (during 1959-1960), but expanded to as many as 35 during the 1960s, particularly during years when over 1000 singles made the Hot 100 pop charts. However, the Bubbling Under charts eventually settled down to 25 positions, from 1992 onward.
As of March 17th 2010, the current number 1 single is O Let's Do It, by Waka Flocka Flame.
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The Bubbling Under charts first appeared in Billboard's June 1, 1959 issue. It continued until August 31, 1985, but was dropped from the magazine for seven years, apparently due to lack of interest from radio stations and retail stores. The "Bubbling Under" charts reappeared without fanfare in the December 5, 1992 issue, and continues to the present day.
Several reference books on the history of the Billboard "Bubbling Under" charts have been published by Joel Whitburn's Record Research company. The latest book (from 2005) was Bubbling Under The Billboard Hot 100: 1959-2004 (ISBN 0898201624).
The UK Charts introduced a 'bubbling under' section in the Spring of 1982 - this was a list of 25 singles added on to the Top 75 (although it didn't include any singles which were going down the chart - so many of these songs would have been below #100). In January 1983 a full top 100 was produced and the 'bubbling under' section disappeared. However, the positions 76-100 are considered unofficial, and the UK Charts remains a Top 75, although the numbers down to 100 are still made public.
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