Mainstream Top 40

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The Mainstream Top 40 is an airplay chart from Billboard magazine. It is also known as Pop Songs on People often mistook it for the now discontinued Pop 100 Airplay chart. The chart is solely based on radio airplay, ranking the week's hottest pop songs based on monitored radio detections from a panel of 200 Top 40/CHR radio stations in the United States as measured by Nielsen BDS Nielsen Broadcast Data Systems. Arbitron sometimes refers to the format as contemporary hit radio.

The chart was launched the week of October 10, 1992, along with the Rhythmic Songs Chart as a way to distinguish stations that played a broad based mix of current hits from those who focused on offering a direction centering on R&B/Hip and Dance material.