It also sold 140 million digital tracks in the United States, the association said.

They have no way to verify that you have deleted all copies of the digital track.

A recent advancement in slot car racing has been the introduction of digital tracks.

The digital tracks from the album have sold a combined total of more than 25 million units.

No other album has rung up such a hefty total in sales of its digital tracks.

Until the Quiet Comes was sent as a single 47-minute digital track to music critics who would be reviewing it.

"So far this year, there have been 488,000 physical singles sold, compared with 31.8 million digital tracks."

The report states that online revenues, including digital tracks and video sales, rose by 51.7% to £154m in 2009.

The single has become the most downloaded digital track in Germany since 2006.

She has sold 11 million albums and 75 million digital tracks worldwide.