https://www.billboard.com/charts/greatest-billboards-top-songs-80s       The '80s countdown, tabulated by Billboard, is based on songs' performance on the weekly Billboard Hot 100 chart, with titles ranked based on an inverse point system, with weeks at No. 1 earning the greatest value and weeks at lower spots earning the least. Due to changes in chart methodology over the years, eras (including within the '80s) are weighted differently to account for chart turnover rates