Black Eyed Peas have two of the top three most downloaded songs

Johnny Cash's Guess Things Happen That Way has become the 10 billionth track to be sold at the ITunes online store.

Black Eyed Peas' I Gotta Feeling was officially named the site's most downloaded track, with their single Boom Boom Pow the third biggest seller.

Lady Gaga's Poker Face took the number two slot, with hits Just Dance and Bad Romance also featuring in the top 25.

Louie Sulcer of Woodstock, Georgia bought the 10 billionth track winning a$10,000 (£6,500) iTunes gift card.

Flo Rida, Katy Perry and Rihanna are all credited with two tracks apiece in the top 25 most downloaded chart, with British artists Coldplay and Leona Lewis featuring in the top 10.

All 25 songs were released in the past five years, with the exception of the Journey's Don't Stop Believin', which has gained popularity after featuring in the hit TV show Glee.