Wikipedia:
Top 40 Tracks
Top 40 Tracks is a defunct chart airplay chart from Billboard Magazine. It was created in 1998, when Billboard Magazine changed the airplay profile of The Hot 100 Airplay to include more R&B, Country, and Rock stations to its profile (thus reducing the profile of its Pop stations). To preserve the notion of the former chart, Top 40 Tracks was introduced.
Unlike The Top 40 Mainstream, The Top 40 Tracks (like the Hot 100 Airplay) was based on total statistical impressions not total detections. The Top 40 Tracks was replaced in 2005 with The Pop 100 Airplay.
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