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Nielsen BDS
http://www.nielsen.com/us/en/about-us.html

By capturing in excess of 100 million song performances on more than 2,000 radio and web broadcasters across North America, Nielsen’s tracking of music sales data is used by all major and most independent record companies. Nielsen’s data are featured weekly in Billboard magazine and is widely cited by numerous publications and broadcasters as the standard for music industry measurement.

SoundExchange
http://www.soundexchange.com

SoundExchange is the nonprofit performance rights organization that collects statutory royalties from satellite radio (e.g., SIRIUS XM), Internet radio, cable TV music channels, and similar platforms for streaming sound recordings. SX is the sole entity in the United States to collect and distribute these digital performance royalties on behalf of featured recording artists, master rights owners (like record labels), and independent artists who record and own their masters.

How BMI Pays Royalties
http://www.bmi.com/royalties/

Download an explanation of how BMI calculates and pays royalties to writers and music publishers.