Broadcast Music, Inc
This section contains the most performed songs in the BMI repertoire of more than 3 million works. Only about 1,500 titles have achieved "Million-Air" status, or more than 1 million United States radio and television performances. One million performances is the equivalent of approximately 50,000 broadcast hours, or more than 5.7 years of continuous airplay!
The BMI Top 100 Songs Century

NEA and RIAA: The top 365 songs of the 20th century
RIAA and NEA Announce "Songs of the Century"