Billboard Hot 100 is a list of songs and their rankings.
Before Nielsen SoundScan, year-end singles charts were calculated by an inverse-point system based solely on a song's performance on the Hot 100 (for example, a song would be given one point for a week spent at position 100, two points for a week spent at position 99 and so forth, up to 100 points for each week spent at number one)
On August 4, 1958, Billboard premiered one main all-genre singles chart: the Hot 100, with "Poor Little Fool" by Ricky Nelson its first No

