Billboard Hot 100
The Billboard Hot 100 is the
The weekly sales period was originally Monday to Sunday, when
The first number one song of the Hot 100 was "
Prior to 1955, Billboard did not have a unified, all-encompassing popularity chart, instead measuring songs by individual metrics. At the start of the rock era in 1955, three such charts existed: 
Although officially all three charts had equal "weight" in terms of their importance, Billboard Magazine considers the Best Sellers in Stores chart when referencing a song's performance prior to the creation of the Hot 100. . On the week ending November 12, 1955, Billboard published The Top 100 for the first time. The Top 100 combined all aspects of a single's performance (sales, airplay and jukebox activity), based on a point system that typically gave sales (purchases) more weight than radio airplay. The Best Sellers In Stores, Most Played by Jockeys and Most Played in Jukeboxes charts continued to be published concurrently with the new Top 100 chart.
On June 17, 1957, Billboard discontinued the Most Played in Jukeboxes chart, as the popularity of jukeboxes waned and radio stations incorporated more and more rock-oriented music into their playlists. The week ending July 28, 1958 was the final publication of the Most Played By Jockeys and Top 100 charts, both of which had
On August 4, 1958, Billboard premiered one main all-genre singles chart: the Hot 100. The Hot 100 quickly became the industry standard and Billboard discontinued the Best Sellers In Stores chart on October 13, 1958.
The Billboard Hot 100 is still the standard by which a song's popularity is measured in the United States. The Hot 100 is ranked by radio airplay audience impressions as measured by Nielsen BDS, sales data compiled by
There are several component charts that contribute to the overall calculation of the Hot 100. The most significant ones are: