History
Hot Dance Club Songs has undergone several incarnations since its inception in 1974. Originally a top-ten list of tracks that garnered the largest audience response in New York City discothèques, the chart began on October 26, 1974 under the title Disco Action. The chart went on to feature playlists from various cities around the country from week to week. Billboard continued to run regional and city-specific charts throughout 1975 and 1976 until the issue dated August 28, 1976, when a thirty-position National Disco Action Top 30 premiered. This quickly expanded to forty positions, then in 1979 the chart expanded to sixty positions, then eighty, and finally reached 100 positions from 1979 until 1981, when it was reduced to eighty again.
During the first half of the 1980s the chart maintained eighty slots until March 16, 1985 when the Disco charts were splintered and renamed. Two charts appeared: Hot Dance/Disco, which ranked club play (fifty positions), and Hot Dance Music/Maxi-Singles Sales, which ranked 12-inch single (or maxi-single) sales (also fifty positions, now reduced to ten and available through Billboard.biz only).
These two charts still exist today, under the official titles Hot Dance Club Songs and Hot Dance Single Sales. In 2003 Billboard introduced the Hot Dance Airplay chart (now known as Dance/Mix Show Airplay), which is based solely on radio airplay of six dance music stations and top 40 mix shows electronically monitored by Nielsen Broadcast Data Systems. These stations are also a part of the electronically monitored panel that encompasses the Hot 100.
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