List of number-one Billboard Mainstream Top 40 hits
This is a list of number-one hits on the Mainstream Top 40 every year by the mainstream top 40 from the United States. The charts are created weekly new.
The Mainstream Top 40 chart ( referred to as pop songs even since June 2009) are " The hottest pop songs of the week, listed by mainstream top 40 airplay audience and Compiled by Nielsen BDS. "