Songs are ranked based on an inverse point system, with weeks at No. Due to changes in chart methodology over the years, eras are weighted differently to account for chart turnover rates during various periods. Artists are ranked based on a formula blending performance, as outlined above, of all of their Hot chart entries.
New Top 40 charts announced in...
These are the songs which reached number one on the Adult Top 40 chart during the s. From Wikipedia, the free encyclopedia. Retrieved March 3, Retrieved March 24,
This is a list of songs that reached number one on the Billboard Mainstream Top 40 or Pop Songs chart in From Wikipedia, the free encyclopedia. Retrieved December 3, January 4, Retrieved December 31, January 11, Retrieved January 7,
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