Nielsen SoundScan is an information and sales tracking system created by Mike Fine and Mike Shalett in 1991. SoundScan is a method of tracking sales of music and music video products throughout the United States and Canada. Data is collected weekly and made available every Sunday (for albums sales) and every Monday (for songs sales) to subscribers, which include record companies, publishing firms, music retailers, independent promoters, film and TV companies, and artist managers. SoundScan is the sales source for the Billboard music charts, making it the largest source of sales records in the music industry.
Read More Here: Nielsen SoundScan