One billion digital singles have been downloaded in the UK

"The music industry today celebrates a major milestone in its digital evolution, with the total number of digital singles sold in the UK hitting one billion – according to data tracked by the Official Charts Company.
The 1 billion landmark was reached yesterday evening (Monday), nine years after legal downloads launched in the UK. This period has seen a revolution in music consumption for music fans, artists, record labels and digital services alike.
Adele’s Someone Like You was also confirmed as the most downloaded single of all time by the Official Charts Company, followed closely by Moves Like Jagger by Maroon 5 FT Christina Aguilera, and Gotye FT Kimbra’s Somebody That I Used To Know."

Source:  The Official Charts Company, 9th April 2013
Infographic here