Beyonce's 'Visual Album' sold over 800,000 copies on iTunes in 3 days

"Beyonce’s new album has broken an iTunes record to become the fastest-selling release in the history of the online music store.
The self-titled album sold 828,773 copies in just three days after the singer released her fifth studio album unannounced on Friday morning.
The majority of sales came from the US, where the record sold 617,213 copies.
Apple, which runs the iTunes store, said the album broke the previous first-week sales record set by Justin Timberlake’s 20/20 Experience, which sold 580,000 in March."

Source:  The Independent, 17th December 2013